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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Could you please state which API-Endpoint is affected?
If you use a custom domain and a custom ui, Ory network currently redirects you to the login page with a flow ID. The flow contains the corresponding message.

Which endpoint now throws a 400?
/self-service/login/flows?id=XXX ?

If you don't have a custom UI implementation you won't be affected

"If you use a custom domain and a custom ui, Ory network currently redirects you to the login page with a flow ID"

It would be on `POST /self-service/registration?flow={id}`

Will the response body contain an updated ui with the said error message?