Migration error using SSH Keys "Failed to connect to the source server 'source' ('X.X.X.X') by SSH:

Hello

System Details: Plesk Onyx v17.0.17_build1700161028.14 os_Ubuntu 16.04

Problem: Attempt to Migrate using Authorization = SSH keys

Full Error: "Failed to connect to the source server 'source' ('X.X.X.X') by SSH: not a valid EC private key file"

What works:
Migration in either direction between the 2 VPSs using Authorization = User/password

SSH keys have been setup in both directions. Can login to each server from the...

Migration error using SSH Keys "Failed to connect to the source server 'source' ('X.X.X.X') by SSH: