Home › Forums › Front-end Issues › Don't update email if it exists. Show error on same page in › Reply To: Don't update email if it exists. Show error on same page in
The filter to use is acf/validate_value https://www.advancedcustomfields.com/resources/acf-validate_value/. In your filter test to see if the value for the email already exists and set the error if it does.
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