Basically I ran into the exact same issue as here: https://discussions.apple.com/thread/7744381?start=0&tstart=0
This happened after I updated my early 2015 13' MacBook Pro from El Capitan to Sierra. I tried to search the problem first but didn't have any luck so sorry if this has been posted before. Any help is much appreciated!
Edit: For what it's worth, iCloud Drive and Reminders are also grayed out, with Keychain also grayed out but checked by default.
This happened after I updated my early 2015 13' MacBook Pro from El Capitan to Sierra. I tried to search the problem first but didn't have any luck so sorry if this has been posted before. Any help is much appreciated!
Edit: For what it's worth, iCloud Drive and Reminders are also grayed out, with Keychain also grayed out but checked by default.