If you are authenticating to the Panorama, you should be logging in using admin/admin as user/password combo.
You didn't say if you were attempting to do SSH public key authentication, so I am confused about this.
You would normally use public ssh key to connect to a virtualized linux or unix box, or similar.
I work in GCP and I know there a "console" port available to always have connectivity to the Panorama.
Perhaps you can provide more details, with a simple drawing of what you have, and how you are attempting to connect.
What other questions can we answer for you?
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