Hi @EBloom, I hope that you are well!
Thank you for asking the Community!
I moved your post to the Developers Forum so that you can get help from experts in this field for more visibility.
I found for you this similar thread with a solution from @Teun “Google Tag Manager - Push Form Data to dataLayer” that might help you.
I’d like to share these resources that can also help:
- Find your form GUID
- Get a form by its unique ID
- Submit data to a form
I also wanted to invite a couple of subject matter experts to this conversation: Hi @Teun, @alyssamwilie and @jonchim do you have suggestions to help @EBloom, please?
Also, if anybody else has anything to add and/or share, please feel free to join in the conversation 
Thank you very much and have a great day!
Best,
Bérangère