Which Google account should we use?

Android betas are granted to a Google account.

Tell us the Google account on the phone you'll test with, and we'll grant it access to the Kiren beta.

Not sure? On your Android phone, open the Play Store and tap your profile icon. The address shown there is the one to give us. It does not have to be a Gmail address.
Please enter a valid Google account email
We'll only use this address to grant your phone access to the Kiren beta. It's stored alongside your signup and does not change the address we email you on. See our Privacy Statement.

Got it.

We'll grant that account access to the Kiren beta and email you as soon as it's ready to install.

When you get that email, make sure the Play Store on your phone is signed in as this account before you tap the link. If it's signed in as a different account, the beta won't show up.