Why Am I Getting a 403 “event submission rejected with_reason: ProjectId” When Using the Envelope Endpoint? – Sentry Help Center

Issue

If you’re sending data to Sentry using the envelope API and receiving an HTTP 403 error with the response:

{"detail": "event submission rejected with_reason: ProjectId"}

this is most probably related to your organization’s data region.

Applies To

Customers using the Envelope API
Customers hosted in the EU

Resolution

If your data is hosted in the EU, you’ll need to send envelopes to your region-specific ingest endpoint instead of the default US one (POST /api/<project_id>/envelope/)

It will look something like this:

https://o123456789.ingest.de.sentry.io/api/1234567/envelope/

In this format:

o123456789ingest.de.sentry.io is your EU ingest domain
1234567 is your project ID

Using the correct regional ingest URL ensures the request is routed to the environment where your project actually exists, and the 403 error should no longer occur.