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.

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~Hi, I am looking for a way to disable all OAuth2 sessions of a subject for a specific OAuth client. Is there already a method which I have missed?~
What is the best way to proceed if I want to ensure that a subject can only have one active access and refresh token at a time for a particular OAuth2 client?

Why do you want to do this? It is important to understand that OAuth2 access tokens are not sessions, and  should not be used as such.

We have a customer who offers both an app and a web app. The login takes place via an OAuth2 client. The customer now wants to ensure that a user cannot be logged in to multiple devices at the same time.