File signed agreements, keep order receipts, bundle handoffs. Every one is ready to run, and you can adjust it in plain language.
Verify owner approval and parent team membership before granting access.
Keep confidential project rosters and private Teams channels in sync, with owner approval and team access checked before anyone joins.
Check approved channel assignments against membership and flag exceptions.
Give new colleagues the channel access their onboarding checklist calls for, with a clear list of what worked and what needs your attention.