Error in OAuth login Cloudflare app

I am trying OAuth integration of clouldflare and ipqualityscore.com. refering from https://www.ipqualityscore.com/documentation/integrations/authentication. But I am not quite sure about the cloudflare app service configuration. This is a screenshot for service config.


As ipqualityscore OAuth doesn’t ask for any client_id, I have not provided any.

On login via Oauth I am getting the following error (in hooks cloudflareapps com trigger):
{ code: "oauth", message: "Error finishing OAuth login" }

Code in install.json seems fine as I have tried to use different Oauth service and I works fine.

Any help is appreciated.
Thanks