You can log in to your account on another device on your computer or on another phone. You should check your account on that device to get the code. If not, confirm that you lost your password to update it.I recently deleted and reinstalled Facebook from my device, after entering my password this page shows up.
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I'm using the same device, there's no way I can get that notification because I'm not logged in.
And there's no other option except for this FB Notifications.
How do I fix this?