Anyone experienced old Chatts and majority of Teams disappearing after upgrade to Tahoe 26.2?

Hello @Matilda Ek,  

Good day! Thank you for posting your valuable question on the Microsoft Q&A forum.  

Based on your description, after upgrading to Tahoe 26.2, you noticed that most of your Teams disappeared from the list, and only the latest five chats remained while older chats were missing.

Please let me know if I misunderstood any part of your idea or you have any additional information to share. 

I’ve checked all current incidents and advisories, and I couldn’t find any reports of this specific problem. This suggests it may be an isolated case or a new bug introduced in the latest update. 

To help resolve this issue, I recommend you perform these steps:

1. Contact the Support Team 

Microsoft Support: 
The issue involves Microsoft Teams, which is a Microsoft product. Reporting it to Microsoft ensures they can check for bugs introduced in the latest Teams update, verify if it’s a known issue, and provide troubleshooting steps or a patch. They also collect diagnostic data to help fix the problem in future releases. 

Since you submitted this under the Business tag, I’ll provide steps for contacting support as a Business user. If you’re using a personal account instead, please let me know so I can guide you to the appropriate steps:  

• Find your Microsoft 365 admin: If you don't know who the global admin is in your organization, you can find guidance here: How can I find my Microsoft 365 admin? - Microsoft Support   
• Submit a service request: The Global Administrator should create a support request with Microsoft to receive advanced technical assistance. For detailed instructions, see: Get support - Microsoft 365 admin | Microsoft Learn   
• If your organization's Office 365 Business/Education subscription is from a partner or reseller, and the global administrator is unable to open a service request on your end, contact the reseller's support provider to help open a service request on behalf of you instead.   

Apple Support: 
Since the upgrade mentioned is Tahoe 26.2, which appears to be related to macOS or an Apple system update, Apple needs to know if their update is causing compatibility issues with third-party apps like Teams. Reporting to Apple helps them investigate whether changes in macOS (e.g., permissions, cache handling, or APIs) are affecting Teams functionality. 

Here’s the support link I found while researching your case. This should help you reach the appropriate team for assistance: Official Apple Support 

Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.  

2. Report this issue to Microsoft Product Team 

On Admin Center (for business user):  

• Ask your admin to sign in to Microsoft 365 Admin center.  
• Navigate to Health > Service health > In the Reported issues tab, Select Report an issue.   
• Fill in the form and click Submit to report this issue.  

Within Teams app: 

• Click the three dots next to your profile > Feedback > Choose Report a problem.    

• You will see a pop up like this > Under Select a category, scroll down to choose "Other":    

• You can fill in the form with your ideas and description to submit the report.    

Your action will assist the Microsoft backend team in investigating and resolving this issue more efficiently. I truly appreciate your effort in helping to address this problem.  

Apologies for redirecting you to the relevant development team. As forum moderators, we have limited access to backend systems, so we've escalated your request to ensure you receive faster and more accurate support.   

If you have any ideas or you find any solution for this problem, please consider replying to this thread.  

In the meantime, you can try clearing the Teams cache for Teams desktop app, as this often resolves related problems: 

On a Mac:  

• Right-click the Teams icon in the taskbar and choose Quit.  
• Next, delete the directory ~/Library/Application Support/Microsoft/Teams.  
• Restart Microsoft Teams by opening the application and logging back in.    

Note: Deleting the cache won't remove Microsoft Teams from your device, but will remove the web client cache, icons, thumbnails, local message history, your Teams display images, and any other Teams add-ons.  

Or if you need any further assistance, please feel free to reply. I'm here and happy to help!  

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