Hi,
I am hitting the INT environment : https://int.api.service.nhs.uk/oauth2/token.
I am getting 401 Error Code.
Application ID : 21420a71-b589-4a24-8149-13a9880e99ce
NHS Digital Onboarding Service - Rhapsody_MSE_TIE_INT
I verified the JWT created with JWT.io and with both public key and Private Key for testing both encoding and decoding and it works fine perfectly.