I have heard from multiple sources that when a user is the only owner of a private channel on a team, but leaves the Office 365 group associated with that team, ownership of the private channel is automatically passed to another member of the team. However, I was curious and tested this, and the following happened:
- User A adds a new channel to Team A and adds User B as a member.
- User A leaves the Office 365 group connected to Team A through SharePoint.
- User B is still a member of the channel; the channel is ownerless.
Why did Microsoft Teams not promote User B to owner of the channel?