# 21765: API Opt-Out/Help Length Invalid

Log Type: TWILIO

Log Level: ERROR

## Description

The campaign submission could not be processed because some combination of the following fields had invalid lengths: `help_sample_message`, `help_keywords`, `opt_out_sample_message`, and `opt_out_keywords`. Please verify that the opt-out and help messages are between 20 and 320 characters each. Also verify each set of comma delimited opt-out and help keywords does not exceed 255 characters.

### Possible causes

Help or opt-out messages/keywords are too long.

### Possible solutions

Limit each message to 320 characters and total keywords to 255 characters.