poll 30 s; sends at minutes after the first: 0.0, 0.5, 1.5, 3.5, 7.5
2026-10-09T12:00:00.000Z notify: dm refused (HTTP 403); retry in 30 s
2026-10-09T12:00:30.000Z notify: dm refused (HTTP 403); retry in 60 s
2026-10-09T12:01:30.000Z notify: dm refused (HTTP 403); retry in 120 s
2026-10-09T12:03:30.000Z notify: dm refused (HTTP 403); retry in 240 s
2026-10-09T12:07:30.000Z notify: dm dec-0001 refused 5 times; gave up, not retried
