---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/82001#article
headline: "82001: Function invocation resulted in StatusCode 4xx"
url: https://www.twilio.com/docs/api/errors/82001
inLanguage: en
dateModified: 2026-03-11T22:03:37.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 82001: Function invocation resulted in StatusCode 4xx

Log Type: APPLICATION

Log Level: WARNING

## Description

Your Function invocation returned a 4xx StatusCode.

### Possible causes

* Function route does not exist.
* Function is set to Private and invocation request is not signed.

### Possible solutions

* Check the Function route you are invoking exists.
* Check whether the Function's *Access Control* is set to Private and whether you intended to have it set as so. If it is Private, then your request must be properly signed.