Google Drive webhooks only send the initial sync, never update… am I missing something obvious?

Google Cloud Integration Services
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1

I’m trying to use Google Drive push notifications with Django and I can successfully create the watch channel I get the initial sync notification but I never receive update notifications for file changes. No errors anywhere, and polling works perfectly. It used to work perfectly, and then suddenly I stopped receiving notifications of changes to my webhook.

Stack: Django 5 + Uvicorn, Drive API v3, OAuth (refresh tokens), webhook via ngrok, DB stores channel info.

What works:

  • Webhook is reachable (405 GET, 200 POST)

  • Manual POST to webhook works

  • changes().watch() returns valid channel_id + resource_id

  • Initial sync arrives instantly

  • changes().list() detects real changes (page token moves)

What doesn’t:

  • No update webhook calls for create/edit/delete/move/rename

  • ngrok shows zero requests except the first sync

  • No logs or errors anywhere

Questions:

  • Can Google silently drop subscriptions? Any way to check status?

  • Does using ngrok free tier break push notifications?

  • Missing params like supportsAllDrives=true? Wrong token source?

  • Any way to see delivery logs?

Anyone here actually got Drive push notifications working recently?