I've had the same problem with FULLI. The problem is that some UK banks don't accept requests from European banks for regular payments, like Direct Debits. Its a Brexit benefit. So when FULLI ask for payment, the bank have no authority to pay it, even though the IBAN number is supplied. When I've received notification of non-payment, there is an option to pay by credit card, which I did. However the next visit to France, the badge wouldn't work, because the bill hadn't been paid - it had and I had an email from FULLI, confirming it had. Another toll tag provider ULYS, produce a direct debit mandate, which they ask the customer to send to their bank. First Direct (HSBC) won't accept Direct Debit mandates from Overseas banks. Barclays Bank seem to accept the payment requests and other advice suggests opening a WISE account, which is based in mainland Europe.