Are you getting a nonce failure or a required field failure?
If ATTENDEE_LIST is empty but showing as required and will not let yo save, add a space to the field so that it has ‘something’ within it and it should allow you to save (it’s a bug we are aware of and will get fixed).
The support post ‘Custom message in Automated Upcoming Event Notification’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.