Happ key on Android
Take the Android build from the happ.su downloads page, not from a random APK in a chat. Then paste your own link.
Where to install
HappSales does not publish a Google Play URL and does not hand out APKs. Current files are on happ.su. That avoids a lookalike build.
Import
Copy the URL in the account. In Happ: “+”, then paste. On a TV or a second phone, use the QR next to the link.
If it does not connect
Refresh the subscription by pulling down. Check that the term in the account is still active and that a messenger did not cut the line. Then write to support. Do not go looking for someone else’s key.