How can we use the cloud build privatePool in google cloud deploy - google-cloud-platform

Question

We cannot make the cloud deploy job run the RENDER or DEPLOY in another project's private pool, we can make it use the private pool in the project that hosts the cloud deploy.
Following the documentation of the cloud-deploy setup here: https://cloud.google.com/deploy/docs/execution-environment#changing_from_the_default_pool_to_a_private_pool and here: https://cloud.google.com/build/docs/private-pools/set-up-private-pool-environment#setup-private-connection I have created a clouddeploy.yaml with the following parameters:
apiVersion: deploy.cloud.google.com/v1beta1
kind: Target
metadata:
name: k8-target
description: apply development
requireApproval: false
gke:
cluster: projects/development-k8-cluster/locations/europe-west1/clusters/development-k8
executionConfigs:
- privatePool:
workerPool: projects/vpchost-project-development/locations/europe-west1/workerPools/cloudddeploy-pool
usages:
- RENDER
- DEPLOY
In summary: there's a cloudbuild project, a k8s project and a clouddeploy project. However, no matter what I do I cannot make the cloud deploy job run the RENDER or DEPLOY in another project's private pool. It does run, but in the clouddeploy project itself. There are no logs, or errors until the deployment phase. Where either cloudbuild starts up inside the clouddeploy project and not in the private pool project or there is an eventual timeout and the pipeline remains stuck as there is no cancel function.
I have given the clouddeploy service account, the cloudbuild service account, a custom service account (not shown in the yaml above) and the default compute service account: owner privileges, cloud deploy runner privileges, cloud build owner and worker pool user privileges.
The request from cloud deploy appears empty except for a run ID that is created when a job is submitted with:
cloud beta deploy releases create.
After the deploy release is picked up the job will not do anything until a there is a timeout.
Can anyone see what i've done wrong or has anyone managed to make this work?
EDIT Following a comment from one of the contributors: I expected the 'privatePool' field to be filled and a job running in either the cloud deploy host project or the cloud build project but there is no activity in either.

Answer 1

You can use another project's private pool, but the Cloud Build instance (and thus where builds show up along with the logs for them) will always been in the project where the Cloud Deploy pipeline lives
Note that in order to make this work, the you will need to grant permission for that pool to be used across projects (See the note under: https://cloud.google.com/deploy/docs/execution-environment#changing_from_the_default_pool_to_a_private_pool)
For logs to show up, you will need to ensure that the service account that is running the build has logging permission in the same project where the delivery pipeline exists.
If the service account being used for the build is not in the same project as Cloud Deploy, you will also need to grant Cloud Deploy act-as permission to use that service account