unlicensed global administrators need to have complete control or be informed when their action require a license.
we have our global admins unlicensed as a security measure, and when we tried to turn on "subscribe members" and "allow outside senders" with office 365 groups, and it threw error messages each time. i went to the exchange admin side and verified this was turned on, but on the microsoft 365 admin center it showed as off. it took 4 hours working with 2 different people at premier support to figure this out. there was also nothing in documentation anywhere which said this was a limitation. when i gave a global account a license, it showed up correctly on the microsoft 365 admin center.