Looks like any Power BI App shared with the Entire Org is visiable to the External Users once signed up to view the first App. By clikcing on App then Get More Apps they can see all Apps Shared Inte...
cdok1091
Advocate II
Advocate III have the exact same problem. I created an AAD B2B security group for external / guest users. Then I explicitly shared a Power BI app with that security group. When a guest user in that security group goes to 'get apps', that user can see all apps shared with all users in the AAD.
When a guest security group is created, the members of that group should be able to see only the apps that have been explicitly shared with them. The members of a security group containing external users should NOT inherit access to other apps published to 'all' [internal] users. This is a serious problem and needs immediate correction.
Please advise when this is fixed!