# 21757: Opt-In Keywords Contain Invalid Characters

Log Type: APPLICATION

Log Level: ERROR

## Description

The campaign submission could not be processed because the provided `opt_in_keywords` were invalid. Please verify that all keywords have alphanumeric and unaccented characters only.

### Possible causes

Keywords include special characters or accented letters.

### Possible solutions

Use only unaccented alphanumeric characters for keywords.