Apologies for resurrecting an old thread but I have exactly the same issue - but I can't opt out/in as to opt back in requires me to enter my bt ID which MUST be a btinternet address. Mine isn't so I can't opt in? Help!
Tried it. Allows me to opt out, but when opting back in it says 'registration failed - please try later'. It actually does opt me back in to using BT WiFi but fails to configure my HH6 for the hot-spot.