My company moved to MS teams and I have its app client on my Macbook (BigSur 11.5.2).
When scheduling a meeting, I have to copy all team member's emails, which I found very strange. Then, I discovered that, from the Windows client, when we set a meeting, all members already show up in the invitation, as it should be.
To schedule these meetings, I go to the team, general channel. Then, I click "Schedule a meeting" in the top-right corner" (see 1st screenshot). Next, I get the meeting invitation (2nd screenshot). Note that "required attendees" is empty, but it shouldn't.
This looks like a bug, but I cannot find an easy way to report it.