Troubleshooting Arize: Error Exporting Traces in AI Agents Course

Hello, I'm doing the "AI Agents Mastery"course and in the lab1 I got this error when running the agent (note : I have changed the tracer endpoint to use the CA region - as I did in a previous tutorial in the "Get Started" section of the documentation). I don't see any trace (or even the project) on my Arize dashboard.

ERROR:opentelemetry.exporter.otlp.proto.grpc.exporter:Failed to export traces to otlp.ca-central-1a.arize.com, error code: StatusCode.INTERNAL