Symptom : A user at our tenant is not able to share files with external users. This issue is occurring for the Office Group, when the user tries to share a folder from the "Documents", with an external user, the following message appears "Sharing to external users is not supported". However when a colleague shares a document with the same external user account, the sharing is successful. The affected user has created a new Office group and tried to share a document with an external user, however the same message appeared. In the Office Admin Center, Security & Privacy, the tenant has the following settings: Let users add new guests to the organization - on Let users share SharePoint Online and OneDrive for Business content with people outside the organization - on Users can share with - new and existing external users (sign-in required) In the SharePoint Admin center: Allow users to invite and share with authenticated external users Let onl...
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