Request Token the Authorized Bearer only Create not an encrypted data

Hi Team ,
I am facing an issue with Request Token .If hit the Request Token the Authorized Bearer only Create not an Lengthy refresh token (eg : eyJjdHkiOiJKV1QiLCJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiUlNBLU9BRVAtMjU2In0 ) . only Bear is created . but Postman its creates . whats the issue.

and the refresh token will expires on 1 hrs . how to get using automation. could you please any one.

Thanks