previewAuth, this call installs a token and starts enforcing the gate from that point on.
The plaintext is returned exactly once in the response. Only the SHA-256 hash is persisted server-side; the server cannot show you the token again later.
| Status | When |
|---|---|
404 | Sandbox not found, or owned by a different org |
410 | Sandbox is stopped or error |
503 | Database not configured (combined-mode CP without PG) |