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365 Groups "Full Teamsite" & External Sharing
I tried to share a single library/file from an 365 group's teamsite with an external user not beeing a member of the group. Regretfully, SharePoint does not allow it, telling me its prohibited by pol...
You can change the default using PowerShell.
From https://support.office.com/en-us/article/Manage-external-sharing-for-your-SharePoint-Online-environment-c8a462eb-0723-4b0b-8d0a-70feafe4be85?ui=en-US&rs=en-US&ad=US:
"By default, all SharePoint site collections that are part of an Office 365 Group have the sharing setting set to Allow sharing only with the external users that already exist in your organization’s directory. To change this setting, you can use the Set-SPOSite Windows PowerShell cmdlet."
You can only share Office 365 group document library with guests who have been invited to join the group. But individual group files can be still shared with guests users through file sharing from SharePoint Online