IAP GCIP integration results in HTTP 404 error on /config resource

Question

Trying to integrate Github OAUTH2 using Google Cloud Identity Platform and Identity Aware Proxy on GCP and Firebase UI deployed on Cloud Run (out-of-the-box). I have owner role for this account

Getting following error from browser console, when trying to access protected application. Redirection seems to be happening but the firebase UI is not shown.

A specified resource is not found, or the request is rejected by undisclosed reasons

The resource url resulting in HTTP status 404 is https://iap-gcip-hosted-ui-app-engine-app-app-specific-code-de.a.run.app/config

Do I require any specific privilege besides the Owner role. Below url is accessible, which is meant for configuring firebase UI

https://iap-gcip-hosted-ui-app-engine-app-app-specific-code-de.a.run.app/admin

Answer 1

Looks like a bad reference to auth ui project. Reuploading auth ui project to the firebase hosting (associated with gcp project) made it work

Answer 2

I was running into a similar symptom, and the problem was that I didn't have any "Identity Providers" enabled other than "Anonymous", which the GCIP tool didn't know how to use.