About the new post on the Google Groups of PNV SDK:
https://groups.google.com/g/firebase-pnv-announce/c/44tx7z_Pc8w/m/99O0BfW4AAAJ?utm_medium=email&utm_source=footer
https://firebase.google.com/docs/phone-number-verification/android/get-started

"You must have a publicly accessible privacy policy to complete OAuth brand verification. You can use Firebase Hosting to create a basic web app to host your test privacy policy."

It mentions to have privacy policy related to this, but doesn't mention what to put there.
I tried to contact Firebase support, and they said to me to request it here, with these details:

"
It should clearly say, in simple words:
that your app reads the user’s phone number,
why it does this,
whether the number leaves the device or is sent to any server,
and how users can contact you.
"