Apple Watch Ultra - Data plan issue - Error code 14

[IpswichTim]

I have just purchased an Apple Watch Ultra directly from Apple as a replacement for my Apple Watch Series 6.

I have set everything up with no issues except for the Mobile Service. 

I have had the cellular version of the watch ever since O2 enabled it with no issues, until NOW!. Whenever i try to setup the mobile service via the Watch App on the phone I get an O2 page with error message saying Oops something went wrong, Reference code 14.

I've done all the usual, restarting both watch and Phone, I've even repaired the Watch. I ring O2 Tech support on Friday and the guy couldn't fix it, saying he'll esculate it and someone would call me back. to date no one has. 

Anyone else had this, what was the fix? Do I just need to ring them back and try another support rep?

Any Help or Tips would be much appreciated

[MI5]

@IpswichTim 

Lots of connection issues reported.

See this https://community.o2.co.uk/t5/Tech-Support/Apple-Watch-Ultra-Disconnecting-from-Cellular-Data-and-on...

[IpswichTim]

Hmmm Doesn't make for good reading! Just spoken to 'Support' again, they are sending me ,(By Post!) a QR code. what the hell is that going to do! I await to be surprised.

[MI5]

Naff all at a guess.