Hi,
this is a know Scylla Manager issue (see `scylla-manager-agent check-location` command fails to handle region · Issue #3691 · scylladb/scylla-manager · GitHub) that will be fixed in next releases.
When there is no region specified in agent’s AWS config, Scylla Manager tries to fetch this information and fails (because of running on GCP). This indeed prints an error log, but it shouldn’t have an effect on the actual procedure.
So does SM work correctly despite this error in logs?