X_PWA_PUSH_FAILED

the push service did not accept the message, and may later

a 429, a 5xx or a connection that never opened. retry-after: thrown by pushToActor after every other device was tried, so the notifier job retries

x jobs list --json — the job retries on its policy. A stated Retry-After rides in meta.retryAfterSeconds, which a job calling pushToActor directly waits out; through pushChannel the failure is X_NOTIFY_DELIVERY_FAILED and the notifier's own backoff applies