Welcome to the community, Enter77!
A look into the spam folder of the SMS app might help to find the missing activation link. These messages often end up there incorrectly.
If the message remains missing, it is best to contact the hotline:
0800 707 707 / Mon. - Sat. 08:00 - 22:00, Sun. 09:00 - 22:00 to clarify the activation.
Cheerio, cosmo