Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

Ory Community

Are you using an SDK?  If so it would be very helpful to have more background information so we can answer the question better. 
First step GET against the api and you will find the issuer in the response JSON

<https://www.ory.sh/.well-known/jwks.json|https://www.ory.sh/.well-known/jwks.json>

“issuer": "<https://playground.ory.sh/ory-hydra/public/|https://playground.ory.sh/ory-hydra/public/>",