Reply To: Custom validation message does not show

• John Huebner

• November 10, 2023 at 12:26 pm

It could be that the key is incorrect.

Is this field that you are trying to validate a sub field of a repeater, flex or groups field?
Is this field a cloned field?

Try this

function custom_validate ($valid, $value, $field, $input_name) {
  if (strpos($field['key'], 'field_64ad703e1fab1') !== false) {
    return $field['key'];
  }
  return $valid;
}
add_filter ('acf/validate_value', 'custom_validate', 10, 4);