How to verify on different machine?

[Furisto]

I am using the AWS Signer plugin to sign a container image like so:
notation sign myimage:foobar --plugin "com.amazonaws.signer.notation.plugin" --id arn:aws:signer:eu-central-1:12345678:/signing-profiles/furisto_test

I can verify the signature on the machine where I signed the image successfully with:
notation verify myimage:foobar

How would this work when I try to do the verification on a different machine? The above command will obviously fail because the key is not present. I do not see an option to specify that the AWS signer plugin should be used during verification. Is the idea that notation key add should be used? Then how do I specify the key during verification? Basically what is the workflow to verify a signature after I have signed the image from a different machine?

[Furisto]

Figured it out. The issue was actually that the plugin silently failed because it was missing the AWS region.