I am working on an app that will generate an email pre-selected URL with trackers. The idea is that the email will be generated in the end-user's outlook, so they can add recipients from their address book. Ideally this email will have custom HTML formatting.
I followed this guide:
here is an overview of the details section of the app:
Currently I cannot get an email to generate with the HTML I keep getting the below error:
Any advice or assistance would be greatly appreciated.