I'm not sure if this is a problem or expected behaviour.
Staff have pre-booked repeat meetings months ago, now we have a Teams Room using the Crestron tablets with integration.
They edit the repeat meeting and use the Teams Meeting plugin to make it a Teams meeting but the tablet does not get the Join button.
If a new meeting is created (that does not conflict) this works fine. I think this might be a "past tense" issue.