Segment Destination Delivery Failures (4xx Errors)
Quick answer
Most 4xx responses such as 400 are not retried; fix the payload or credentials, then replay if your plan allows. Transient failures are retried for about 4 hours.
Most likely fix: Read the error
How to fix it
Try these in order — the most common fix is first.
1. Read the error
- Open Delivery Overview > Failed delivery and note the status code and message
Did this fix it?2. Fix the mapping
- Add required fields in the Actions mapping
- Use the Mapping Tester
Did this fix it?3. Reauthorize
- Reconnect the destination credentials
Did this fix it?4. Request a replay
- Replays are available on request for Business tier customers
Did this fix it?
Symptoms
Delivery Overview shows failed deliveries with 4xx codes.
Why it happens
- Invalid payload or missing required fields
- Expired credentials
- Rate limits at destination
- Missing match keys for ad platforms
This guide also covers
- segment destination 400 error
- segment retry logic
- segment failed delivery
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