In such a case, you will see a ! warning symbol next to your mismatched contact details (mobile number / email ID) in your Added Bank Accounts section. If you wish to EVC-enable that bank account, you will need to update your contact details on the e-Filing portal to match your details registered with the bank or update the mobile/email at bank’s end same as your e-filing registered primary mobile/email. Once details are updated, revalidate your bank account.