There can be a few reasons. Some of our users received new IBANs that start with 'LT' instead of 'GB' at the end of last year due to Brexit. We made it possible to use both 'LT' and 'GB' IBANs for Direct Debits, but this was temporary. Direct Debit collections to old account details with 'GB' will fail from 30th September, 2021. If this happened with your Direct Debit, please make sure to update your account details.
Another possible cause is because you don’t have enough money in your account. If you have enough money in your account and your Direct Debit is still failing, contact our support team via the in-app chat who will be happy to help.