Had similar issue before. My and my friends are traveling to a different city and one of my friend's mobile went missing during our trip. The contact we were about to stay in the city is in that mobile (saved in his Google Contact thankfully). When he tried to login his account in my mobile to access it, Google wouldn't let him. He had to use the secondary email he registered with email(which is from Yahoo) to send a verification code and use that to login to the Google account. He also forgot the password for the secondary mail id and finding that was another story.
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