SFTP SSH: Auth Cancel error

Hi Team,

We are trying to connect to this 3rd party via SFTP using SSH key. The problem is that every time we poll their server, we are getting this "AUTH CANCEL" error in PI system while the partner says they get bad pub key error.

We tried to connect to the same party via SFTP this time using password and we were able to connect successfully.

Clearly it's SSH key issue. However, we are using the same key for all our 3rd parties and it's working fine for them.

Any thoughts?

Thanks,

Carlo