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An interesting issue appeared in a current Windows Server 2022 multi-user environment:
✅ Microsoft Teams Meeting Add-in was installed
✅ Outlook showed the add-in as active
✅ TeamsAddin.FastConnect reported Connect = True
❌ Yet the Teams button was missing from the Outlook calendar
The cause was no longer COM registration, but a missing configuration file:
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%LocalAppData%\Publishers\8wekyb3d8bbwe\TeamsSharedConfig\app_switcher_settings.json |
Without this file, the Outlook add-in cannot reliably recognize New Teams as the active Teams client. The add-in loads, but does not fully initialize the calendar area.
The solution was to create the file with the following content:
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{"defaultApp":1,"cohort":"","webAccountId_AAD":"","cohortStage":"","userId_AAD":"","previousT1MachineId":"","previousT1SessionId":""} |
Then:
– Close Teams and Outlook
– Start Teams first and sign in
– Then open Outlook
The Teams meeting button was available in the calendar again afterwards.
Particularly important for Citrix, RDS and FSLogix environments:
The following path should persist in the user profile and must not be lost through exclusions or profile cleanup:
AppData\Local\Publishers\8wekyb3d8bbwe\TeamsSharedConfig
A small missing JSON file with a big impact: a classic Microsoft 365 moment. 😉
