I had this recently at my club; the answer was that I didn't have the latest version of the app on my phone. Updated it and all was good.....worth a punt?
** Sorry that should have said my nominated attester didn't have the latest version...apologies!
If I could blow my own trumpet, I wouldn't leave the house... :D :p
Seriously though Jon, congratulations, nice thing to have achieved and to be able to promote for your business.
Ian