# 21766: API Opt-Out/Help Characters Invalid

Log Type: TWILIO

Log Level: ERROR

## Description

The campaign submission could not be processed because some combination of the following fields had invalid characters: `help_sample_message`, `help_keywords`, `opt_out_sample_message`, and `opt_out_keywords`. Please verify that all keywords have alphanumeric and unaccented characters only.

### Possible causes

Characters in help/opt-out fields are not allowed.

### Possible solutions

Use only unaccented alphanumeric characters in message and keyword fields.