WARNING. Do NOT use GMAIL for Exchange emails.
This happened to me recently, i have been locked out of my Gmail account with absolutely No way at all of ever getting "back in". A quick search online and you will see posts from thousands of people worldwide, though absolutely no fault of their own, locked out of Gmail with absolutely no way of ever getting back in, even with 2FA on account.
Googles FULY AUTOMATED system is a nightmare and always leads to a dead end.
So PLEASE heed my warning and do not use Gmail. I am currently locked out of my Bitrex account because i need to click a link in my email to log into account, you have to do this if
1. you are signing in from new location or your computer does not save locations, uses VPN.
2. you have not signed in for 30 days.
NOTE: Bittrex now for 4 days have not replied to my request for change of email, BUT obviously i had to make this request from another account as i can not log into Bittrex ZenDesk as i also need to click email link (thats im locked out of) to sign into help desk.
I am shocked that this is not more well known in Crypto, but believe me, there are going to be more and more posts about people getting locked out of account with no access ever again to funds.
If anyone here, has ever got back into a locked gmail account, please let me know how you done it. Also to add, im signing in with same computer, location, ip as i have done so for the last 7 years, Gmail has gone "rogue".