Forum Discussion

Copper Contributor

Mar 23, 2020

calendar missing in teams

I have setup Teams. I am the global admin for my company and access to all portals. All Team meeting policy options and scheduling options are set to yes for me at global level. In the desktop and...

Doc1.docx514 KB

Meetings

StevenC365
Apr 20, 2021
Let me sum up this thread for people just joining now. If the calendar app is missing from the left of Teams there are two possible reasons

1. (Most Likely) - Teams can not find or access your calendar. It will only access a calendar from the exchange mailbox associated with the users account, if you don't have one, then no calendar. Also if you use Exchange hosted on-premises you will need to have hybrid configured to allow Teams to access that mailbox. Read more starting at How Exchange and Microsoft Teams interact - Microsoft Teams | Microsoft Docs

2. (Less Likely) - Someone removed Calendar in an app setup policy assigned to that user. This will hide it from the left menu but it will still be there if you press the ... Menu at the bottom. See Manage app setup policies in Microsoft Teams - Microsoft Teams | Microsoft Docs

Abd_Alwahsh

trecee-michele13

Copper Contributor

mitchpj75 I wanted to post this becuase it took me a while to figure out what was happening. First check your App Policies in Teams admin center and be sure that the user was not put into a first line worker or other poilcy that would potential block the Calendar App.

But this is what was the issue with a few of my users - EWS

Run Get-CASMailbox and check all EWS policies are enabled for the user

EwsApplicationAccessPolicy

The EwsApplicationAccessPolicy parameter controls access to the mailbox using Exchange Web Services applications.

Valid values for this parameter are:

EnforceAllowList: Only applications specified in the EwsAllowList parameter are allowed to access the mailbox.
EnforceBlockList: Applications specified in the EwsBlockList parameter aren't allowed to access the mailbox, but any other applications can access the mailbox.

richardskates

Copper Contributor

Nov 30, 2020

Yes I was testing disabling certain Basic Authentication protocols in preparation for Microsoft disabling them next year (https://developer.microsoft.com/en-us/microsoft-365/blogs/deferred-end-of-support-date-for-basic-authentication-in-exchange-online/), but when I disabled Exchange Web Services (EWS) it broke the Teams calendar. I assume they will have to update Teams to use something other than EWS then...

Gregory Neumarke
Brass Contributor
Dec 10, 2020
richardskates Thank you for posting this. This was exactly my situation. I had disabled Exchange Web Services on my account for testing. Outlook add-ins stopped working, seeing coworker's free/busy was broken, and of course the calendar was missing in Teams. Restoring EWS resolved these issues I'd been having for weeks.
Now my understanding is that EWS only uses basic authentication, if that is true I am wondering how we are supposed to move to only Modern Authentication?
- ChristianBergstrom
  Silver Contributor
  Dec 10, 2020
  Have you gone through all the prerequisites?
  
  https://docs.microsoft.com/en-us/microsoftteams/exchange-teams-interact