Out of curiosity, what Mac is this happing on?I'm having the same issue, in my device it says 'Find My Mac' is turned off, but everything is turned on. I will follow this post - I'm relieved that I'm not the only one experiencing this issue!
Do you have other Macs, and is Find My working ok on them?
The tech advice bod who's in charge of my case, said he has a "carbon copy" of this issue with another person he's looking after.