Yes I tried to manually transfer and i was getting the same error.
I tried what the error was saying and referred to the SK however i noticed that the SK is not updated the steps they advised us to follow is not supported on r81.10 that is what I think.
Here is what the SK recommends add ssh hba hostname <HOSTNAME> public-key access-mode online fingerprint <SHA256_FINGERPRINT>
However the working command is add ssh hba hostname <HOSTNAME> public-key access-mode online fingerprint <FINGERPRINT>
Thank you for the response issue has been resolved.