Why was my endorsement “improper”?

You need to verify you have signed the check as it is written and included the words ‘for mobile deposit’. If your name on the check differs from the way your name appears on your account, you will need to endorse the check both ways: as it appears on the check and as it appears on the account. If the check is payable to more than one person and the names are joined by ‘and,’ both parties must endorse the check.