Apple ID two-step verification - unknown error
I am trying to set up two step verification but every time I complete the process I get an "unknown error" message.
I have tried this numerous times....
I get and use the SMS code ok
I enter Recovery key code as requested ( to show I have a copy )
I put a tick in agree , it appears to be saving - web page goes signs me out of Apple ID and displays " an unknown error has occurred "
I have reset browser waited for 24 hours , same as above occurs again
Any ideas what is going wrong?
Many thanks
Martin