Ok, i do understand how it works,
(sorry for my poor english)
First you need to change the way you connect to google. No more email but sms!
you have to go to google website in your account
https://myaccount.google.com/signino...ign-in/welcome
(connexion and security => connect to google)
Your android phone have to use this account. (google will send sms to this phone.) Then when you've finish this procedure , every time you'll connect something like a computer to google, you'll recieve a sms.
so now, in gnome online : add a google account, enter the mail adress then you will recieve a sms to confirm the conection ,and gnome don't need a password, it will connect.
Once gnome is connected, if you want, you can change the preference in your google account to use password instead of sms
That works like a charm

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