ricmar at the same time the option was grayed out
I have never heard of this happening before. I can only think of two reasons why adding another profile would be blocked: using a secondary profile which doesn't have the access, or if the phone is managed by some device admin app and adding profiles is blocked (I don't know if device admin apps can block this, so I could be wrong). Maybe there's an explanation I just am not thinking of.
Very strange. If it does happen again, maybe a reboot will fix it.