Communication cloud build to cloud run

[outflier]

Hi,
I am trying to call one of my cloud run services via cloud build.

My cloud run service network is configured with
- Ingress control: internal
- A VPC connector to our default VPC network on this project
For cloud build,
- I create a private pool on the default VPC network of this project as well and using a custom IP range which I created following https://cloud.google.com/build/docs/private-pools/set-up-private-pool-to-use-in-vpc-network

However, with this setup, the builds fail because the requests to https://MYCLOUDRUN.run.app/get failed with 404.

Thanks for your help!