A. 1. Double-check that the bank account details you are entering are correct, including the account number and sort code. Any small error can lead to linking issues. 2. Ensure that your bank account is compatible with Mollie. Some banks may have restrictions or may not support certain types of transactions. 3. If you continue to face issues, try using a different browser or device to link your bank account, as sometimes browser settings or extensions can interfere with the process.