We are not able to charge your account

I’ve jumped through all the hoops so far to become an Amazon seller, the latest was to verify all the European Amazons with a £1 charge but my account still shows this:

Unable to charge

We are not able to charge your account. Assign a valid charge method to restore full access to your seller account. For more information, refer to our Help Pages.

I’ve used a debit card, not credit card but that should no be the reason or perhaps it is?