Your iCloud account couldn’t be removed at this time. find my Mac is still on and can't uncheck the box (Mac OS Sierra needing to upgrade but can't until iCloud user changed or iCloud system presences turned off)
I need to update Mac OS to High Sierra but cannot because iCloud system preferences is having a problem but can't switch users or shut of find my Mac on this user to shut of iCloud for this device or even sign out of iCloud at this time in order to update to high Sierra.
This Mac can’t connect to iCloud because of a problem withOpen iCloud preferences to fix this problem.