POST Request; Form; Cloud Function; Firebase

Hi all I am running in to a bit of trouble. I have created a cloud function to send an SMS when a user submits their phone number via a form. I have set the action equal to the cloud function URL but am not sure what else I have to do. I have included a photo of this working in a different tool, again not sure how to recreate in webflow.

I greatly appreciate any help or feedback!

Here is my site Read-Only: