We are using SharePoint Online. Our on-premise AD is synced to the Azure AD. I have a problem with nested (A)AD groups and permissions. In my SP site I created a SP group. In this group I added an (A)AD group as a member. The (A)AD group holds several other nested (A)AD groups. This is something we have successfully done with other SP sites many times before.
In this particular case though, none of the members of the (A)AD groups get access to the SP site. Only if I add someone to the SP group directly they get access to the site.
I have queried Microsoft Graph to check if the sync from our AD to AAD works well. This is the case. The members of the AD group are all transitive members of the above mentioned root AAD group. So syncing works well.
What can be the cause of this issue?