Form Webhook Not working for Google Web app

Prerequisites
[x ] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
[ x] The issue still exists against the latest stable version of Elementor.
Description
I am trying to submit the form’s data, form generated through Elementor Pro, into a webapp created through Google App script using webhook.
I have checked changing the theme, as suggested here, but that also is of no help.
In theme editor as well, I do not see any webhook that gets created. I have tried following themes:

Astra Pro
OceansWP
2020 default wordpress theme
I am a newbie.
Steps to reproduce
I am trying to post the content collected in a form in a google app script based web app. I have hosted the web app by using the code as described here, verbatim.
Next I have gone into creating a new page with form widget and have, under ‘Actions After Submit’ chosen ‘webhooks’. Under the tab of ‘Webhook’, I have pasted the URL that is generated from the web app.

I check the stackdriverlog but I am not able to see any invocation of the webapp when I submit the form.

Isolating the problem
[X ] This bug happens with only Elementor plugin active (and Elementor Pro).
[ X] This bug happens with a default WordPress theme active.
[ X] I can reproduce this bug consistently using the steps above.
Environment
I am using the hosted wordpress of GoDaddy.