We have a SharePoint online tenant. now i created a new Office 365 group which contain our global admin, then i reference this group inside the sharepoint's sharing settings as follow (i did this around 2 months ago):-
I did this to only allow global admin to share files and sites with external users. But today i access the above page and i got this error:-
so i am not sure what caused this error? and most important thing to us, while we have this error, could any user share sites and files with external users? i mean if this setting is corrupted,, so how did the external sharing worked while the setting is corrupted? Had it prevented anyone (including the global admin) from sharing with external users (best case)???.. or it could allowed anyone to share with external users (which is a disaster !!!)