I’m facing the exact issue. Were you able to resolve this?
– Fixed –
- Create IAM Service Key file from here: https://cloud.google.com/iam/docs/creating-managing-service-account-keys
- Update your configuration with the JSON file as mentioned here: https://www.chirpstack.io/application-server/install/config/ (look in [application_server.integration.gcp_pub_sub] section).