Unable to add an Apple Watch Plan

[Andy8802]

I have just joined O2 on a sim only contract.

I'm trying to add a watch plan for my son's Apple Watch but it is giving me the message "The O2 account on this iPhone cannot be used to add a mobile plan to "xxxxxxxx Apple Watch". For more information about Apple Watch mobile plans visit https://www.apple.com/watch/cellular.".

I have called O2 and was told to go to an O2 shop as they couldn't work out why it wouldn't let me order a watch plan.

Anyone had this before and know how to solve it? Need to get it sorted before the 14 day cooling off period so I don't get stuck with O2 if they can't fix it.

[pgn]

All the gotchas with Apple watch pairing (which only works when paired with a Contract (Refresh, SIMO or bundled), not a PAYG (Big Bundle, Rolling Plan or Classic), SIM!) handset with O2, here: Activate Apple Watch Guide @Andy8802 

Contacts for help included in each section. Good luck!

[MI5]

@Andy8802 

How long have you had the simo as it might take a few days for the number to be populated on all the O2 systems.

Also, a direct debit is required to pay the sim plan so this may not yet be registered until the first payment is taken.