What happens? Any error messages? How are you trying to do this? On the app, on the website or by text? Whatever way you're using try another one and see if it works. If not then you'll have to contact 48 support. See the link in my signature below.
Hope this helps.
I am not a 48 employee so if you need to contact 48 support then use option 3 or the chat facility here.
I had to find a pay zone store and buy a voucher (credit) to put on my account. I then had to sign in to my account and buy membership, it was paid for from the credit in my account..
