Okay so there are a couple of things to note or if you can supply.
make sure you have the following in all your html files.
<script src="https://extension-files.twitch.tv/helper/v1/twitch-ext.min.js"></script>
When you create the zip file don’t include the root directory.
If those aren’t the issue maybe a good old F12 and inspect the load to see if there are any errors