(Disregard: Assumes keys already setup.)ssh -oHostKeyAlgorithms=+ssh-rsa -o "PasswordAuthentication=no" -o "IdentitiesOnly=yes" -i ~/.ssh/id_rsa_-_$myKeyHere
Confirmed against a OWRT 19.01 x64 VM fr a Deb 12 VM. Welcome to the world of obsolete SHA1. Update your ~/.ssh/config
accordingly.