Unable to establish Transmission Configuration Connection with Bank of America for importing Bank st

We were able to establish the connection with Bank Of America UAT instance server with the use of PGP keys however we are unable to do the same with PROD instance server. We have run the SQL query to check if any inbound file got transmitted but it was blank. Also checked on the PGP keys if it was an issue by running Import Security credentials Job ess process and verified the secret and public keys were intact. So we are suspecting the issue from Bank of America in terms of security. Can you provide any additional information which is