How to Grant Everyone/All Authenticated claims to external users in O365?

[Venkata Ratnam Vemula]

Hi,

From March 23rd, after Microsoft updating the behavior and governance of access by external users in Office 365(https://support.microsoft.com/en-hk/help/4089534/how-to-grant-the-everyone-claim-to-external-users-i...), Is it possible to grant access to external users like earlier?

Earlier, we have given Forms Membership with Contribute role to a SharePoint list, which helped external users to add items to the list. With this change, the external users are not able to access the list anymore.

Snippet

                <pnp:Security>
			<pnp:BreakRoleInheritance CopyRoleAssignments="false" ClearSubscopes="false">
				<pnp:RoleAssignment Principal="c:0!.s|forms%3amembership" RoleDefinition="Contribute" />
			</pnp:BreakRoleInheritance>
		</pnp:Security>

[#2 · Accepted solution]

I learned that the Administrator can change the behavior of these groups after the Microsoft had made the change on the external user access.

The following link will be helpful.

https://nigelbrowne.com/big-changes-are-coming-to-external-user-in-office365/

One more observation is that - The change might not reflect immediately. It took 4 hours in our case after which it is working as expected.