For a number of our services, we ask you to provide a private SSH key. For PuTTY users, this can cause an issue as we do not use the PuTTY-keygen format. Here is how you can convert your PuTTY key to OpenSSH format:
Open your private key in PuTTYGen
Top menu “Conversions”->”Export OpenSSH key”.
Save the new OpenSSH key when prompted.