Is principalId Always a GUID in Microsoft Graph ??
{ "error": { "code": "Request_BadRequest", "message": "Invalid GUID:HR", "innerError": { "date": "2026-02-13T06:44:24", "request-id": "87678d90-1d94-4131-a705-4356ad3568a4", "client-request-id": "63569c7b-1dea-42d4-8d72-aa3668c78418" } } } We’re encountering an issue with the Microsoft Graph API response for directoryRole Recently, one of our Graph API calls started returning a response where the principalId value appears to be a custom string instead of the expected GUID. In our code, we loop through each id from the delta response, assuming it will always be a valid GUID. However, we are now getting errors because one of the returned principalId values does not match the expected format. Our questions: Is it possible for Microsoft Graph API to return a custom string instead of a GUID for principalId? Has anyone experienced similar behavior with delta queries for directoryRole or any other object? Are there any known scenarios where the principalId format differs from the standard GUID? Any insights would be appreciated.
Slow UI update for deleted events
I've built an integration that continuously syncs events between an external scheduling system and Exchange Online using Microsoft Graph. I'm observing a recurring issue when deleting calendar events via Graph: A DELETE request to Graph returns success (204 No Content). A subsequent GET /events/{id} returns 404, confirming the event is deleted server-side. However, the event continues to appear in the Outlook UI (both Outlook Web and desktop) for an extended period (sometimes hours), even after page reloads or app restarts. The odd behaviour The event is still displayed in the user interface for up to several hours The event persist through page reloads If the user clicks the event it opens briefly and immediately closes, the event disappears from the UI afterward. Additional details Delete endpoint: /users/{id}/events/{id} Graph response: 204 No Content Verified deletion via GET → 404 Reproduces in both Outlook Web and Outlook desktop Questions Is this a known Outlook client caching or calendar view indexing issue? Is there a way to force client reconciliation after deletes? Are there Graph or Exchange constraints around rapid create/update/delete cycles that could cause this UI inconsistency?
How to Retrieve Windows Edition (SKU) from managedDevices API
Hi everyone, I am working with the Microsoft Graph API endpoint /v1.0/deviceManagement/managedDevices to iterate through all devices in a tenant and collect operating system related information. For Windows devices, the operatingSystem field only returns "Windows". However, Windows has multiple editions such as Enterprise, Education, and Pro. For my use case, I need the specific Windows edition. Is it possible to retrieve this information using only the v1.0 endpoint, or is the beta endpoint /beta/deviceManagement/managedDevices/{managedDeviceId} required to get the SKU family? Thanks in advance for your help.Resource not found while trying to access the available resource
I am attempting to automate CRUD operations on Microsoft Entra objects using the Microsoft Graph API. However, I am encountering a Resource not found error when accessing a resource programmatically, even though the same resource is accessible without issue when invoking the API endpoint via Postman.
O365 Group email settings
I am in the middle of trying to create some automated routines that create groups in O365 and add/remove members from them as needed. One of things I ran into is that when an email is sent to the group, the emails are not going into each members' inbox and are only visible in Outlook through "Go to groups" in the left hand menu. I can see the settings that need to be set but can't set them because either, A: it just doesn't do it or B: says I don't have permission. Doing this through C# and the Graph SDK The two items I think I need to turn on are below. What permissions are needed to be able to manage those settings but NOT be able to have access to anyone and everyones' email boxes, emails, etc or is there another way to do this? IsSubscribedByMail AutoSubscribeNewMembers
Entra Conditional Access Issue
Hi Guys, Our Outlook add-in relies on the Graph API to fetch emails. Due to customer-side Conditional Access (CA) Policies, we are seeing critical failures where Continuous Access Evaluation (CAE) demands user interaction (InteractionRequired code) to resolve challenges like LocationConditionEvaluationSatisfied or TokenCreatedWithOutdatedPolicies. Since this authentication occurs backend-to-Entra, we lack a frontend mechanism to prompt the required user interaction. Is there a recommended pattern, method, or architectural change that allows our backend to redirect or challenge the user for interactive sign-in, thereby satisfying these CAE requirements and unblocking customers? Exact error messages: 1. Continuous access evaluation resulted in challenge with result: InteractionRequired and code: LocationConditionEvaluationSatisfied 2. Continuous access evaluation resulted in challenge with result: InteractionRequired and code: TokenCreatedWithOutdatedPolicies403 Error: Application access policy not found, -Global scope not available in tenant
Hi everyone, I'm trying to use Microsoft Graph API to retrieve online meeting details using an application identity. However, I receive a 403 error with the message: "No application access policy found for this app" I followed the documentation here: Configure application access policy, but I encountered a problem: the -Global scope mentioned in the documentation is not available in my tenant. I’ve successfully granted the policy using the following methods: Option A – Grant to Specific User Grant-CsApplicationAccessPolicy -PolicyName "YOUR_POLICY_NAME" -Identity "email address removed for privacy reasons" Option B – Grant to AD Group New-CsGroupPolicyAssignment -GroupId "YOUR_GROUP_ID" -PolicyType ApplicationAccessPolicy -PolicyName "YOUR_POLICY_NAME" These work fine, and the app can access online meetings for users or groups assigned this way. However, I need to allow the app to access meetings across the organization, and the -Global assignment method is not available in my tenant. Questions: Is there an alternative to -Global for tenant-wide access? Is this limitation expected in certain tenant configurations? Any workaround or best practice for enabling organization-wide access to online meetings via Graph API? Thanks in advance!403 Forbidden when sending mail with app-only token via Microsoft Graph
Hello, I am trying to send emails from my Outlook account using a registered enterprise application in Azure AD. We created an application registration in our tenant, assigned the relevant users, and granted admin consent for these Microsoft Graph application permissions: Mail.Send and Mail.ReadWrite and Mail.Send.Shared. I authenticate with application credentials (client_id, client_secret, tenant_id) and successfully retrieve an app-only access token using MSAL in Python: def get_access_token() -> str: load_dotenv() client_id = os.getenv("CLIENT_ID") client_secret = os.getenv("CLIENT_SECRET") tenant_id = os.getenv("TENANT_ID") authority = f"https://login.microsoftonline.com/{tenant_id}" scopes = ["https://graph.microsoft.com/.default"] # app-only token app = msal.ConfidentialClientApplication( client_id=client_id, client_credential=client_secret, authority=authority ) result = app.acquire_token_for_client(scopes=scopes) if "access_token" not in result: raise RuntimeError(f"Auth failed: {result.get('error_description') or result}") return result["access_token"] The token is retrieved successfully. However, when I try to send an email with: GRAPH_BASE = "https://graph.microsoft.com/v1.0" def send_email(access_token: str, from_user: str, to_address: str, subject: str, body_text: str, save_to_sent: bool = True) -> bool: """ Sends a plain-text email via POST /users/{from_user}/sendMail using an app-only token. Returns True on success; raises HTTPError on failure. """ payload = { "message": { "subject": subject, "body": {"contentType": "Text", "content": body_text}, "toRecipients": [{"emailAddress": {"address": to_address}}], }, "saveToSentItems": bool(save_to_sent), } r = requests.post( f"{GRAPH_BASE}/users/{from_user}/sendMail", headers={"Authorization": f"Bearer {access_token}"}, json=payload, timeout=20, ) r.raise_for_status() return True …I get this error: 403 Client Error: Forbidden for url: https://graph.microsoft.com/v1.0/users/{from_user}/sendMail File "C:\mail\src\mail.py", line 53, in send_email r.raise_for_status() ~~~~~~~~~~~~~~~~~~^^ File "C:\mail\src\mail.py", line 111, in <module> send_email(token, from_user, to, "Hello from Microsoft Graph", "Hello Human") ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requests.exceptions.HTTPError: 403 Client Error: Forbidden for url: https://graph.microsoft.com/v1.0/users/{from_user}/sendMail where {from_user} is my actual mailbox address (e.g., email address removed for privacy reasons). Since the app has Mail.Send (Application) permission with admin consent, my understanding is that the app should be able to send mail on behalf of any user in the tenant using /users/{user}/sendMail. Is there another configuration step I am missing (e.g., Application Access Policy or mailbox-level Send As requirement)? Any guidance on why this 403 happens despite having Mail.Send application permissions with admin consent would be very helpful. Thank you!Granting App ability to change group memberships by making it an owner?
Hello, We'd like an app to be able to control memberships of only certain security groups using app-based authentication. Today it is documented that a GroupMember.ReadWrite.All role is needed to do this on the app registration: https://learn.microsoft.com/en-us/graph/api/group-post-members?view=graph-rest-1.0&tabs=http This, however, grants access to the app to make changes to any group. However, we have noticed that API calls to change memberships work on groups owned by the Service Principal. For example, if I make a call to the API below for memberships and the app is assigned as the owner of the group, it works. https://graph.microsoft.com/v1.0/groups/{{group-id}}/members/ Is this a supported mechanism? I don't see it documented anywhere.
Slow download speed using GRAPH api
I wanted to start a little discussion because I can't find any information about my issue with download speed of GRAPH api. So Let's start with some information that I have a python app that connect to my One drive Business. I have there two folders with pdf's one is about 70k and one is 7k. I connect to them successfully. I know that this API has some limitation with the amount it can download on one request but still I think it is not fault but my and lack of knowledge. The biggest problem is when I use some search feature in my app that requires searching a specific file(it just freeze my whole app). I make all communication inside my python code and I don't see any room to further optimization. I will just mention that this is my first time working with API and clearly don't know where to ask for any help.
