I am referring to your 16 character, alphanumeric, 2FA back up codes. If they are incorrect, then your only option is to contact the exchange and explain the situation. If they are correct, but you are somehow importing them incorrectly or are out of sync and are generating the wrong 6 digit 2FA codes, then importing them with different software on a different device or asking someone else you trust to import them, and seeing if the 6 digit codes they generate match the 6 digit codes you generate, will reveal if you are doing something incorrect.