While there can be several reasons for error, most likely is:
GCP VM you created does not has permission to write to storage bucket. The VM creation command that I have written (as below) has scope: “https://www.googleapis.com/auth/cloud-platform” which gives VM permission to all the GCP APIs including GCS Writes.

If you created your VM from UI, it only gives GCS reads permission to VM.

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Database Migrations Engineer, Google Cloud

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Shashank Agarwal

Shashank Agarwal

Database Migrations Engineer, Google Cloud