When internal communication to Admin API is configured to have mutual TLS configuration the volumes and volume mounts need to have additional mtls-client certificate included. That certificate could be generated in volume mounts if internal Admin API has disabled mutual TLS, but any other internal listener has it enabled.
When internal communication to Admin API is configured to have mutual TLS configuration the volumes and volume mounts need to have additional mtls-client certificate included. That certificate could be generated in volume mounts if internal Admin API has disabled mutual TLS, but any other internal listener has it enabled.