Microsoft Teams - Outlook Calendar - Not Syncing

Hello Ryan_K16,

Thanks for your post in Microsoft community. Regarding your issue, we would like to suggest you to open Outlook web app and open Teams Online app and check the appointments syncing status. Further from your post, we had observed that Web-version syncing some appointment, do you mean that appointment created from Teams app and some of them are visible in Outlook Web app, if possible , request you to kindly provide us some screenshot for Teams and Outlook Web app, so we can compare the actual scenario.

Further for testing purpose, suggest you to create one new test appointment from Outlook Web App and check if its sync on Teams online app or not (you may test vice versa, it helps us to narrow down the issue)

If appointment sync has no issue on Online app and issue is just with Outlook client and Teams client app, please check the below suggestions.

A. Check your Teams and Outlook app are updated with latest versions.

• For Teams Client app : To check this : click on your profile picture from Teams app > click on Check for updates (it helps to update your Teams with latest version)
• For Outlook client app: Go to File > Office Account > Update Options and click on Update Now (it helps to update Outlook with latest version)

B. Try to clear Teams cache.

• Fully exit the Microsoft Teams desktop client. To do this, either right click Teams from the Icon Tray and select ‘Quit’, or run Task Manager and fully kill the process.
• Go to File Explorer, and type in %appdata%\Microsoft\teams.
• Once in the directory, you’ll see a few of the following folders:

1. From within ‘Application Cache’, go to Cache and delete any of the files in the Cache location.: %appdata%\Microsoft\teams\application cache\cache
2. From within ‘Blob_storage’, delete any files that are located in here if any.: %appdata%\Microsoft\teams\blob_storage
3. From within ‘Cache’, delete all files.: %appdata%\Microsoft\teams\Cache
4. From within ‘databases’, delete all files.: %appdata%\Microsoft\teams\databases
5. From within ‘GPUCache’, delete all files.: %appdata%\Microsoft\teams\GPUcache
6. From within ‘IndexedDB’, delete the .db file.: %appdata%\Microsoft\teams\IndexedDB
7. From within ‘Local Storage’, delete all files. : %appdata%\Microsoft\teams\Local Storage
8. Lastly, from within ‘tmp’, delete any file. : %appdata%\Microsoft\teams\tmp
9. Once finally done clearing, you can now restart Teams from your local desktop and all cache will be cleared from the desktop app.

C. Start Outlook in safe mode (with CTRL + R and type : outlook.exe /safe) and check the result.

• If it works in Safe Mode, then the is likely to be a conflicting or corrupt add-in. Disable all add-ins and then open Outlook to confirm, if it works then enable add-in one by one until you get to the one which stops Outlook.

If the above suggestion doesn’t help, kindly let us know how have you configured your Outlook account (such as Exchange , POP3 or IMAP)?

Thanks and regards,

Ankita Vaidya