Reference
SUBJECT_NOT_FOUND
Access subject not found
Access subject not found
HTTP status 400 Bad Request, code SUBJECT_NOT_FOUND.
What it means#
The user or role a channel access grant names does not exist in this organisation.
What to do#
Use a user id from GET /users or a role id from GET /roles.
On the wire#
Every error response carrying this code names this page in error.moreInfo,
with the request id in the query string. See Error codes for
the response shape and the list of every code.