An error occurred while saving the commentLisa Roebuck commented
Same issue we've been tracking here: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_win10-mso_o365b/cannot-add-teams-meeting-to-a-single-occurrence-of/fbf2db7e-e8b3-443f-bed9-ec1f9dd6ce31?messageId=3b874b75-1426-48a8-ab05-9f8fbbdfa199&page=4
This is a serious problem for our users who manage a lot of shared calendars with recurring events that are set up for clinical evaluations, but the attendees to each evaluation change. To protect PHI and maintain HIPAA compliance, a new Teams invite link is put into each occurrence of the series, to prevent the wrong clients from attending the wrong occurrence of the series. For our clinicians, its a series of events that recurs. For our clients, it's a single event. To set up these hundreds of events for our clinical team per week individually would be a nightmare.
The option to add a Teams meeting to a single occurrence still works in OWA, so that leads me to believe this is not functionality created on purpose but is something someone broke. Unfortunately, shared mailbox calendars that have logins disabled cannot be used in OWA this way so that is not a good workaround for us (or anyone that relies on the desktop app).