Teams App on iPhone/iPad Shows Strange chats

Dear @Stefank,

Thank you for reaching out to the Microsoft Q&A Community.

Thank you for providing a detailed description and the screenshot. Since you've already performed all the standard troubleshooting steps, this indicates the problem is not with the app itself or the device.

The fact that these strange chats appear for all your business accounts and on different mobile devices points to a server-side issue with your Teams profile data. The "Lorem ipsum" text strongly suggests that the server is failing to load the correct chat data and is displaying placeholder information instead.

Unfortunately, this is not something you can fix yourself. The issue requires intervention from your organization's administrator. Your IT administrator will likely take the following steps to resolve the server-side issue.

1. Review your account's status: They can check for any provisioning errors or signs of data corruption related to your Teams profile.
2. Investigate service health: They can review the Teams service health dashboard to see if there are any ongoing incidents or outages that could be causing the issue.
3. Clear Server-Side Cache or Profile Data: This is the most likely solution. Since the problem persists across devices, the administrator will use PowerShell or other admin tools to perform a "soft reset" of your Teams profile data on the server.

Steps to Perform a Server-Side Soft Reset This is a task for your administrator. The following steps use PowerShell to clear the user's cache and force a new synchronization.

If the Teams module is not already installed, the administrator needs to run this command in PowerShell:

Install-Module -Name MicrosoftTeams -Force -AllowClobber

The administrator needs to establish a session with the Teams service. They will be prompted to sign in with their admin credentials.

Connect-MicrosoftTeams

Clear the User's Server-Side Cache This is the command that performs the soft reset. The administrator needs to specify your UPN (User Principal Name) or their email address.

Clear-TeamUserCache -User "******@yourcompany.com"

Note: Replace "******@yourcompany.com" with the actual user's email address.

After the command is successfully executed by your administrator, you should perform the following actions on your device to force a clean synchronization:

Sign out of the Teams app completely.

Clear the local Teams cache on your device (this is an extra step for thoroughness).

Sign back into the Teams app.

By clearing the server-side cache, this process forces the app to rebuild your profile data from a clean state, which should resolve issues related to corrupted chat lists or other profile-related problems.

I hope this information helps clarify the situation and provides you with workable solutions. Should you have any further questions or need additional assistance, please don't hesitate to reach out. We're always here to help. Have a wonderful day!

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Thanks for the hint. Will give this a try.

But how likely is it that this cache-mess on server side happens to all my business accounts from different tenants?

Thanks for the hint. Will give this a try.

But how likely is it that this cache-mess on server side happens to all my business accounts from different tenants?

Dear @Kai-L ,

sorry for the late reply.

I tried to clear the server-side Teams user cache. But this fails as there is no commandlet „Clear-TeamUserCache“ in the PS module MicrosoftTeams. I cannot even find any reference to such a PS function on the web.

Are you sure that‘s the correct commandlet?

And does Teams really have a server-side cache for user data and the clients get served by this cache only?

Just wondering, as already mentioned, the problem appears for all business accounts on different tenants. Meanwhile I figured out that these strange chats are from some meetings years ago. Unfortunately there is no option to just delete these chats.