Not sure why this isn't working. But i have a Google Optimize experiment setup...

It changes the string in a title

The variant page loads correctly

The Optimize experiment itself connected properly to my app

I added the gtag.js script to my app through Google Tag Manager

<script type="text/javascript" id="" src="https://www.googletagmanager.com/gtag/js?id=UA-12345678-1"></script>

And

window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments)}gtag("js",new Date);gtag("config","UA-12345678-1");

It is a custom html tag in GTM which i got warned not to do, but not sure how else to put it in.

The page is tracking as a page viewed in the main GA real time info. But when i click "View my report in Analytics" in Optimize, it takes me into GA, where there's no hits being recorded. It's just 0% bounces / activity.

What have i done wrong?