--private-key-file arg should have highest precedence

[dioguerra]

When using --private-key-file and having a system ~/.ssh/opkssh folder (on MacOS) the opkssh app will alwys use the standard file naming with
login.microsoftonline.com_<tenant_id>+<something>_v2.0-<client_id truncated>{,-cert.pub}

The argument --private-key-file should override this behavior

[EthanHeilman]

This is definitely a bug! Do you want to fix or do you want to put together a PR?