Setting override ssh host key on FortiGate

[jaypat]

I'm trying to set ssh host key using my own generated key following the instructions at https://docs.fortinet.com/index.php/document/fortigate/7.6.0/cli-reference/207795941/config-system-s.... The document doesn't specify what is the format for ssh-hsk parameter. I'm using ssh-keygen to generate the private key. Then remove the BEGIN/END and concatenate the lines together. However, this gives me an error "The password does not match hostkey!" when I run end command to commit the settings.

Does anyone have an example how to do this correctly? Thank you.