Hi
When trying to access the page, did you see any error, such as permission or anything else? Are you trying to access both project from the same user account? It seems like a permission error to me. I would recommend to check all permissions and roles are the same for both projects. You can check this[1] link to review your project level access control using IAM.
[1] https://cloud.google.com/resource-manager/docs/access-control-proj#permissions_and_roles