Looker Standard instance creation

I tried creating a GCP trail looker instance and carried out the following setup

1. Created a Oauth consent screen with allow external users , and configured the test users to control who can access the Looker web application , these users also have Looker admin IAM role.I also added looker.app in authorized domains for consent.

2. Created Oauth creds and added the URI of looker instance with /oauth2callback after looker instance creation.

I followed this https://cloud.google.com/looker/docs/looker-core-trial doc. for creating the instance but when users try to login using web URL they get the following error

Lakshaykumar_0-1692088483584.png

any help regarding this error will be much appreciated. Thanks in Advance

0 0 206