You can add them in the other form builder within Elfsight but not the subscription form version? Why is that?
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Hi there, @casswhitaker 
Good question!
The Subscription Form widgetis designed to be simple and focused on just the essentials for collecting subscription info, which is why it only includes the four key fields—Short Text, Email, Consent, and Choice. We kept it streamlined to make the process as straightforward as possible.
I hope this explains things
If the Hidden field is crucial for you, we recommend you using the Form Builder or Contact Form widgets instead. Do they cover your needs or you’d prefer using the Subscription Form?
If you’d still like to have a Hidden field in the Subscription Form, please describe your use case. We’ll be happy to discuss it with you 