How to add private keys into certificate credential library within SAM?

I use .ppk to authenticate to my linux servers and wanted to setup some java monitoring on these servers but that would require me to import my private key into Orion

I read online and within the community that in order to upload/import keys into Orion that I would need to convert they into PEM Format.

So, I used PuttyGen to convert my PPk file into a PEM file and loaded it into Orion and received the following error:

The private key is not formatted correctly or it is encrypted and the password is either wrong or missing. It is also possible that an error occurred during import.

Is there something that I am missing? Should there be something specifically done to avoid the above error. I'm at standstill in getting this figured out and would greatly appreciate if anyone could help