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I try to connect on my VM with my ssh key (legacy project)

When I try to connect on my VM with a SSH key generate with a username that I founded in my console, and fill in GCP metadata. I receive a permission denied. I try to change SSH key my coworker, and her connexion work always. Is there an another place for to change or to add ssh key in GCP ?
However, my coworker added my ip in VPC.

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