File signed agreements, keep order receipts, bundle handoffs. Every one is ready to run, and you can adjust it in plain language.
Remove flagged, unapproved direct members and verify the final list.
Keep your discussion channels aligned with access reviews, and give reviewers before and after member lists.
Grant approved channel access and flag requests blocked by access rules.
Give new colleagues the channel access their onboarding checklist calls for, with a clear list of what worked and what needs your attention.