No actor could be resolved for the STT exchange: no explicit actor was passed
and no usable session ID token is available (missing or expired with no refresh token).
Thrown client-side before any network call.
The token exchange request failed.
The actor_token_type is not a valid URI.
The subject_token_type is not a valid URI, wrong length, or uses a reserved namespace.
The actor_token was provided without actor_token_type.
The subject_token is missing or empty.
The cte_session_transfer_token feature flag is disabled on the tenant.
Surfaces the server 400 response.
The CTE Action did not call setActor, which is required when requesting an STT.
Surfaces the server 400 response.
Error codes for Custom Token Exchange errors.