Adding v2 Hub to account via smartthings cli or smartthings advanced web?

Yes, I’m going to copy in @SamsungZell to see if that helps and this thread has the UK support phone number so I can try that

That page link was

https://support.smartthings.com/hc/en-us/articles/200293129-How-do-I-reset-my-Welcome-Code-Illustration

which I guess is now replaced / superseded by