Custom claim not returning with OpenIDConnect url

I am authenticating using the Okta account and want the customized token containing the custom claim (upn) with it.
My application authentication url :
this does not return “upn” claim.
But when I try to token preview for default authorization server, it does returns me with “upn” claim.

Need your guidance ASAP as we are planning to go for our customers live updates for SSO using Okta.

Hi, @gdlimbani

Please ensure that your application is authenticating against the default authorization server, as that is where the claim is configured:

Based on the URL shared above, it looks like you may be authenticating against the org authorization server, which will not include the custom claim.