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Guest rights or shares
Is there a way to list what has been shared with a Guest user account in Office 365? I am looking for the specific SharePoint resources or Teams resources that someone invited this guest to view/...
Not directly, but you can either crawl the audit logs for any events related to sharing with that specific user, or generate a report of all externally shared files as detailed here: https://docs.microsoft.com/en-us/office365/securitycompliance/keyword-queries-and-search-conditions#searching-for-site-content-shared-with-external-users
Worst case, you can write some PowerShell to crawl your sites and enumerate all the permissions. Otherwise, you're better off looking at third party tools like SysKit Security Manager: https://www.syskit.com/products/security-manager/ Not sure if there's anything directly for Teams - though I think most of it's sharing is done via the O365 Group - which the SysKit tool will pick up.