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Continue to ChatAdd a user as an admin on all associated SharePoint Sites on a Hub https://sharepoint-tricks.com/add-a-user-as-an-admin-on-all-associated-sharepoint-sites-on-a-hub/
Add a user as an admin on all associated SharePoint Sites on a Hub https://sharepoint-tricks.com/add-a-user-as-an-admin-on-all-associated-sharepoint-sites-on-a-hub/