Sign in with Google when you are ready to create it. What you typed stays.
Name, package name and how many testers you need. About three minutes.
You are hereOne dependency and one line in main(). Upload that build to your closed testing track.
Developers from the board join your test, install from Play and open your app for a minute a day. You do the same for theirs.
The ledger shows who is really testing. Once 12 testers have stayed 14 days, apply to Google with the engagement summary.