iCloud Family Sharing is greyed out
So I just signed up for Apple Music after ending my family plan subscription on Spotify due to Spotify not being available in the country I'm moving to. I want to use Apple Music with my family hence I signed up for the family plan again, but when I go to my iCloud settings on my Mac, it's greyed out. Both my mac and iPhone are up to date in terms of software/iOS.
Please help!
Mac Pro