I don't know it's Samsung one UI 7 fault or Google change it's system for privacy.
If you hard reset your device and try to login in your google account with Email and password, you have to still verify yourself , Google will send you a " Number" and and a pop up message, you have to mark " Yes it's me" and choose that " number",
Problem- Until you haven't login your google account in any other device, that message and number won't appear and you simply can't login,
Phone number verification often blocked by Google displaying the message " too many request today, try again after few hours".
Solution - Iogin your google account in another device before you hard reset your device, so that during the time of verification you can receive the message and number.
No its off from a long time.
Try login once in your browser within few min it will on automatically, check the time
