SSH pub key (rsa_id.pub) does not work with MobaXterm but works with PowerShell and other apps

I used PowerShell to create a SSH key like so:

ssh-keygen.exe
# Enter to accept all default + blank PW
# Saved in C:usersme.sshid_rsa.pub

I can SSH to my server via PowerShell and it works as expected: ssh user@MyLinuxServer

However, when I use MobaXterm it will not connect, even after specifying the id_rsa.pub key file:

No supported authentication methods available (server sent: publickey,gssapi-keyex,gssapi-with-mic)