"Use your device for validation
Fairphone FP2
To enable auto checkout on this device, follow these steps:
On your Fairphone FP2 device, go to account.google.com/phone.
Select "Manage auto-verification status" and enable auto-verification for the Fairphone FP2 device"
Pour commencer, on tombe sur la page d’authentification traditionnelle, saisir l’identifiant habituel (adresse mail) et le mot de passe, puis continuer pour configurer l’authentification automatique.
You just need to launch a browser on the phone, and go to the url indicated. Log in as usual with your Google account and then follow the instructions you copied out above.