Resetting Security Questions

I had this frustrating problem. Initially I noticed the Mail App was using (draining) more than 100 hours of battery in the background in one week. As a proper solution, I deleted the app from the iPhone and reinstalled the app again. But to sign in again after inputting Apple ID and Password, I was being asked 2 Security Questions which I could not remember. I also noticed I was not signed in to iCloud in the Setting (above Two-Factor Authentication) and my Device was not signed in either. So I followed the instructions below but the same problem would persists, a vicious circle, I was being asked the same Security Questions. Finally I discovered the correct solution after multiple try, not given adequately by Apple Support. Here it is:

Before following the instructions below, make sure you are on WI-FI only (no Cellular Data connection). Make sure you allow for cookies on your browser and turn on Location Services. Now if you follow the instructions you will get the option to input New Security Questions, after inputting your iCloud email address and Apple ID Password. After changing your answers to new security question, update your Recovery Email Address, and back up your iPhone. Good Luck.

1. Go to iforgot.apple.com.
2. Enter your Apple ID, then select Continue.
3. Choose the option to reset your security questions, then select Continue.
4. Enter your Apple ID password, then select Continue.
5. Follow the onscreen steps to verify your identity. The information you’re asked to provide may vary based on your account details and other factors. If you don't get any options to verify your identity, you can't reset your security questions at this time.
6. Choose new security questions and answers and select Continue. See our tips for choosing security questions and keeping your account secure.