Apr 07 2021 07:26 AM
Apr 07 2021 07:26 AM
Has anyone been able to resolve the Sign-In Error issue? It appears to be an issue between the Microsoft Authenticator app and Teams. Our organization is using Conditional Access policies to require MFA via the Microsoft Authenticator App. After MFA completes and the phone returns to Teams, the error message is displayed. Azure AD Sign-In log displays MFA success.
Steps to produce:
1. Open Teams
2. add account tscbank.com
3. select work account
4. Flips to Microsoft Authenticator
5. Enter Password
6. Flips to Teams
7. Displays error: Sign-In Error
Here is what I've tried:
- deleted the account from Teams
- restarted the phone
- reinstalled teams
- tried to delete cache from Teams settings in iOS General (never seems to clear)
- removed email address from personal Microsoft account
Apr 09 2021 12:50 PM
Hello @Anon4343 If this older post from our answers.microsoft.com tech support site doesn't provide a solution, you may want to open your own ticket there: Microsoft teams sign-in-error on Iphone - Microsoft Community
Apr 14 2021 07:09 AM - edited Apr 14 2021 07:11 AMSolution
It looks like the issue was caused by Teams not applying an InTune policy. We're using InTune to manage Teams. For some reason, teams wasn't applying the organization's data management policy and was getting blocked. Teams wasn't showing the user that this app will be managed and needs to be restarted.
The resolution was to receive a message in Teams and not view it. Eventually, the user will receive an email stating that a teammate is trying to reach you in Microsoft Teams. Within that email, there is a link to 'Reply in Teams'. If the user opens that link on their mobile device, it correctly initiates data management policy and manages Teams. The user was able to successfully log into Teams.
Nov 30 2021 12:49 PM
Sometimes closing authenticator, teams, and outlook. Then, open Outlook and sign in again resolves the issue.
Mar 24 2022 06:15 AM
Sep 15 2022 01:37 AM
I had a similar problem, suddenly could not join Teams meetings on my iPhone anymore because I had no internet, according to the app. But my iPhone was connected to the internet, other apps were connecting fine.
My solution was, go to Settings > Find the settings for Teams in the list of apps > Tick "Mobile data". Somehow this was switched off....
Hope this helps someone.
Dec 22 2022 12:41 AM
Sep 05 2023 12:14 AM
@Anon4343 have had similar issue for months. microsoft useless im afraid (4 months of support with them refusing any face to face support in person).
i solved it myself
i could access my work microsoft account for teams and office on all devices (iPad, pc, mac) except my iPhone, my personal microsoft account was unaffected - despite me seeing in the authentication app both work and personal accounts.
I went into the portal (https://myaccount.microsoft.com), selected security info, and added another sign in method for my work microsoft account (selected authenticator app from the drop down), clicked next and scanned the QR code using the iPhone. This miraculously wrote over the top of the existing work account authentication and hey presto - full access on my iPhone.
Hope that helps