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Can't connect via SSH

We have a VM running Linux hosting our SFTP.  In the past, I could connect via SSH, but now cannot.  I can get to the SFTP web UI, so I know the server/app are running.  When connecting via Putty, it says  "This service allows sftp connections only" and disconnects the session.  When trying directly from the GCP UI, it says I need to open the firewall for incoming to 0.0.0.0:22, however, my CTO can connect via SSH with no issue.  My IP address is already in the network tags for the VM.  I've given myself Owner permissions at the project level, and it still doesn't connect.  Any thoughts?

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