Forum Discussion
External File Sharing from O365 Groups allows user full access to site
Interesting find that is could cause major problems. Sharing is turn on at the tenant level as prescribed by Microsoft Also turned on sharing for each O365 Group via Set-SPOSite Command as stated...
A Group site is just a SPO Site so I can only think on accessing to the "old" permissions page in SPO and disable access request there...you might need to grab the permissions url for a classic site if you don't have it in the site settings page