Microsoft is changing the default setting for guest access to Teams from Off to On. This won’t affect tenants already using Teams, but it’s a good opportunity to review how guest access is used in tenants and consider whether existing guest accounts are needed or can be removed. This post offers some ideas about using policies to control guests and how to check what these accounts are used for.
You can apply an Office 365 Sensitivity Label to control different aspects of Groups, Teams, and Sites. One of the settings controls whether guest users are allowed in group membership. We explain how to use PowerShell to search groups assigned a label to block guest access for existing guests, just in case you want to remove them.