X_NOTIFY_DIGEST_UNSUPPORTED

a digest window is declared on a bulk channel

digest: beside a bulkChannel(). Refused where it is written: a bulk send has one payload for the whole audience and a window coalesces PER RECIPIENT, so the two have no shared meaning — and inventing one would be this package deciding whose events get grouped

drop digest from that entry and give it a wait instead, or deliver it through deliveryChannel('<name>', …) one recipient at a time