# 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.