Teams Outlook Calendar Plugin

If your Outlook Teams Calendar plugin disappears, try to follow the instructions at:

https://support.microsoft.com/en-us/office/about-the-microsoft-support-and-recovery-assistant-e90bb691-c2a7-4697-a94f-88836856c72f?ui=en-us&rs=en-us&ad=us

Run this a couple of times, choose th "Fix Teams Plugin" option when prompted, following the instructions to open Teams first, then Outlook.

If this doesn't work, the only known workaround is to use the web based calendar at outlook.office.com and create your calendar item there.