Hi, returning to inform how the issue was solved. A bit of context, looks like the databricks apps runs on the databricks/microsoft backend, and not on our clusters. The control of the network ingress rules is done via SEG (https://www.databricks.com/blog/announcing-egress-control-serverless-and-model-serving-workloads). To fix the issue, on the SEG for your workspace you need to add pipy endpoints. It worked for me when configured as follows: