Teams Processing Causes Problems for Disabled Azure AD User Accounts
Organizations often disable Azure AD accounts when users leave or for other reasons. What you might not know is that Teams then removes the account from membership of individual teams. A background process looks for disabled users and removes these accounts from team memberships. That doesn't sound too bad, but what's horrible is when you unblock an account. Teams takes a long time (at least 24 hours) to restore standard teams, it might not ever restore membership of org-wide teams, and private channel membership is removed too. It's not a good situation.
April 20, 2021