Cannot set up mobile service of Apple Watch

[LonMum]

I've spent an hour on the phone with O2 and am no nearer to setting up my son's Apple Watch.

We have a new Apple watch (SE + Cellular) bought from Apple, that is not yet linked to a network.

We have an Apple iPhone 12 which pre-exists my O2 account but the full "erase and transfer" procedure has been done on it before we set it up for my son. It has just been connected to O2 today via a physical SIM.

I have a monthly SIM-only plan (100GB)

I have put a £30 spending cap on it.

I have tried to set-up the mobile by using the Watch app > Mobile Service

It tells me "Your O2 account is not eligible to enable mobile service on your Apple Watch."

I've turned the phone off/on, and I've done a network settings reset.

 
The O2 representative says as far as he can tell, my account should have the ability to do this (direct debit in place, I'm on a monthly tariff, etc).

Any advice gratefully received!

[LonMum]

FWIW, in this case the wait 24 hours did not work -- only the SIM reset did. But I'm relieved it's working now!

[pgn]

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@LonMum wrote:

FWIW, in this case the wait 24 hours did not work -- only the SIM reset did. But I'm relieved it's working now!

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Thanks again, @LonMum - out of interest, was it a reset of the eSIM in the watch, or of the SIM in your phone handset that kicked it all into life?