Permission error running Google Vertex example

I'm trying to run the Bison examples on their website as well as Python in colab and I'm facing the same error. When initially started this I was prompted to enable services, which I did, but it's still not working. Since this is my personal test I'm logged in as Owner.

ERROR. Permission 'aiplatform.endpoints.predict' denied on resource '//aiplatform.googleapis.com/projects/cloud-ai-frontend/locations/us-central1/publishers/google/models/chat-bison@001' (or it may not exist).

In Collab the error is as following:

PermissionDenied: 403 Permission 'aiplatform.endpoints.predict' denied on resource '//aiplatform.googleapis.com/projects/cloud-ai-frontend/locations/us-central1/publishers/google/models/chat-bison@001' (or it may not exist). [reason: "IAM_PERMISSION_DENIED"
domain: "aiplatform.googleapis.com"
metadata {
  key: "permission"
  value: "aiplatform.endpoints.predict"
}
metadata {
  key: "resource"
  value: "projects/cloud-ai-frontend/locations/us-central1/publishers/google/models/chat-bison@001"
}
]

Update 1: I used the policy troubleshooter, entered my Gmail address, resource1 being //aiplatform.googleapis.com/.../chat-bison@001 (as above) and permission 1 aiplatform.endpoints.predict it tells me
"You do not have the required permissions to troubleshoot policies on the specified resource"

Update 2: I created a new project and it's working fine now, but I'm still bugged by the fact that the other project doesn't work

I tested and it works normally.

You can try following this notebook I tested.

https://colab.research.google.com/drive/1m2FrsUPlazVx2BZUdxKKJ_3FFDTRohar