I’m trying to send server-side events to an EU Residency project from Bubble backend and also tested directly in Postman...

I’m trying to send server-side events to an EU Residency project from Bubble backend and also tested directly in Postman. My project is on EU Residency, so I’m sending to: POST https://api-eu.mixpanel.com/track?verbose=1&ip=0 I tested with:

Body used:

{
  "event": "Test Event",
  "properties": {
    "token": "MY_PROJECT_TOKEN",
    "distinct_id": "test-user-1"
  }
}

I also tested with hardcoded values only, no dynamic placeholders, and I get:

{
  "error": "data, missing or empty",
  "status": 0
}

I get the same error even if I intentionally use the wrong project token, which makes me think the request body is not being parsed at all. On the frontend, Mixpanel JS is working correctly in Bubble:

So the problem seems isolated to backend/server-side event ingestion. Can you confirm: whether api-eu.mixpanel.com/track is the correct endpoint for server-side event tracking for EU projects, whether raw JSON body with top-level event and properties is still the correct format,