---
page_type: error
code: 21728
message: "21728: Campaign registration failed due to length validation failures"
level: ERROR
product: Programmable SMS
---

## Description

We could not register your US A2P Campaign because one or more field(s) do not satisfy length requirements.

### Possible Causes

One or more field(s) do not satisfy length requirements.

### Possible Solutions

Please fix the error and retry Campaign registration. Please check out our [support article](https://support.twilio.com/hc/en-us/articles/8959909733403-Changes-to-the-A2P-10DLC-Campaign-Creation-Process) to read about the length requirements on these fields.