Grafana integration with okta giving 400 error

I followed this KB (Okta OAuth2 authentication | Grafana Labs)and configured exactly to my grafana instance , but I am facing this issue
error: Your request resulted in an error. The ‘redirect_uri’ parameter must be a Login redirect URI in the client app settings:

I checked this blog(Okta Help Center (Lightning)) as well, followed that too but still no luck