Google Sheet data into Webflow design issue


I am trying to duplicate this project ( which enables to display Google Sheet data within the Webflow design. I have edited custom code section with my credentials (API + spreadsheet ID), but unfortunately the published site does not pull out any data.

Original project works fine, so I assume I must have done something wrong.
Thank you!

P.S - Maybe the creator @mrameez820 of the template could help?

Here is my site Read-Only: Click here