Groups Guest access and SharePoint access

Hi Salvatore,

Well I am happy to say that I figured out how to get External Sharing for Guests working for my groups Office 365 Team Site. 

Scenario-

Unable to Share a Group Folder or File with External Users (Guest)

Guest Sharing Enabled at the Tenant Level - Yes

Executing Set-SPOSite -SharingCapability  ExternalUserAndGuestSharing - Did not work, message still indicated I needed to EnableGuestSharing at the Tenant Level (Although it already was).

What worked for me was executing the following command from PS to enable guest sharing.

set-spotenant -SharingCapability ExternalUserAndGuestSharing

then running this against the site I want to enable guest sharing

set-sposite https://site.sharepoint.com/teams/development -SharingCapability  ExternalUserAndGuestSharing

Long story short, although guest sharing was enabled in the Admin Center, for whatever reason, PS still saw this setting as "off". By enabling this setting using SET-SPOTenant worked.