Direct debit is not supported for this customer, using SEPA
You can enable Display Direct Debit as a payment method for all your customers by setting up the relevant payment gateway and enabling the scheme associated with the country. Example: SEPA for EU
SEPA Payments via Stripe
SEPA Payments via Adyen
SEPA Payments via Mollie
Select customers to whom you wish to display the direct debit payment method in the Checkout and self-serve portal. Select the necessary option from Display Direct Debit as a payment method for All your customers.
This option allows all your customers (including new customers) to pay via SEPA irrespective of whether the Allow this customer to pay via his/her Bank Account option is enabled on the customer's details page.
If you choose ‘Customers with Direct debit payments enabled’, then you must enable ‘Allow this customer to pay via his/her Bank Account option’ should be enabled on the customer's details page.
Edit Customer details page:
Select the option to allow this customer to pay via his/her bank account.
To know more about Direct Debit - Chargebee Docs