CHW-4122 FeatureDisabled

this feature is not enabled on this instance

Default message: this feature is not enabled on this instance
HTTP status: 404 (client)

Problem. The caller hit a feature-flagged endpoint on an instance where the flag is off. Cause. Password reset, email verification, or SSO is disabled via env var, or the required dependency (Postmark, encryption key) is missing. Fix. Ask an operator to enable the feature, or use the alternative flow (e.g. admin-assisted password reset). Returned as 404 so the endpoint is indistinguishable from “not implemented”. HTTP 404.