With a couple of timeline items sharing the same bundle ID, I create the bundle cover with:
TimelineItem timelineCover = new TimelineItem();
timelineCover.setText("Help Options");
timelineCover.setBundleId(bundleId);
timelineCover.setNotification(new NotificationConfig().setLevel("DEFAULT"));
timelineCover.setIsBundleCover(true);
timelineCover.setIsPinned(true);
MirrorClient.insertTimelineItem(credential, timelineCover);
It comes through to the timeline properly bundled but with isPinned = false.
I tried updating the isPinned field to true in the timeline playground but it stays false.
Is it possible to pin a bundle?