Instructions for Forms Autocomplete Field

I have a Maps Key functioning right on a form. I have an Address Autocomplete Field that is not doing anything (behaving like a normal text field). I have searched the site for a tutorial in case I am missing something, but it simply seems to be broken. Please see the form here (click on any button for the lightbox) - https://www.dechraclinicalstudies.com/
Any direction or tutorial would be very much appreciated!
Thank you.

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