Outlook started to show Microsoft Teams invitations as plain text. Here is how to solve it.
After switching to Microsoft 365, Outlook showed links in Microsoft Teams invitations as plain text instead of the known nicely formatted ones.
While searching for this issue, one solution was to check if your mail message format is set to HTML:
This was set correctly in my Outlook and was not the root problem.
Later we assumed, that the security settings we are implementing with the new Office version could be the problem. We started to load only approved add-ins in Outlook.
One Add-in I didn’t want to load is the Microsoft VBA for Outlook Add-in (I mean who wants to use VBA anymore?). After enabling this add-in, newly created invitations are appearing normally again.
If you do not restrict the add-ins, check on the affected clients, if the add-in has not been loaded or if there are other issues with it. To manage your add-ins, click File and then Options. A new windows appears. On the left side, select Add-ins and search for Microsoft VBA for Outlook Addin on the right side.