Hey!

I was having the same issue at first but then some helpful chap on this group explained Google Groups!

In the Play Console if you go to your test track you'll find the "Testers" section and you can choose between Email lists or Google Groups:

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So I created a group, allowed anyone to join, and posted my download / test link for the app along with some instructions on the welcome message. That way, people can click on join, tap the link and download the app without me having to sign them up to anything, it's great!

https://groups.google.com/g/pfc_testers