LG Optimus (android 7) app crashes

Tailscale version: any
Your operating system & version: Android 7

Hi all,

i’m installing tailscale in an embedded system based on LG Optimus smartphone (android 7).
App is installed by APK (ADB tools) since default android distribution hasn’t play store.
I can install app, open it, then it goes to sign up page with two buttons, google auth and “other”. Tapping on google auth does nothing apart showing loading icon for an istant, while tapping “other” crashes app.

In an older unit (same exact model, OS version etc) it worked ok. I tried many version avaiable, from early 1.2.2 to latest 1.6, no change. What i’m missing?