For this project, my ClientID is 2aaxjk731hw6b75gd8zvz141a34h10
I had another instance of the problem this morning with user_id 40028988.
2019-01-03T14:19:35.232Z - stream started, successfully received notification
2019-01-03T14:25:33.373Z - stream title changed, successfully received notification
2019-01-03T17:10 (approx.) - stream title changed again, but no notification received
I double checked the webhook subscription for this user and it’s good until 2019-01-12.