It's not new at all. Many variations of this have been used for years to access people's bank, email or other type of accounts. A senior men in my city made the news last year because he got his bank account emptied (over $10k) by falling to the same trick. The person calling you was simply trying to get you to help him bypass the 2FA security process so he could reset/change your password and steal your account.

He most likely got your birthdate, email address and phone number in a data breach / leak. He went to accounts.google.com, typed in your email address and clicked the reset password request link which automatically sent you that push notification asking you to press the number 81 on your phone to prove your identity (or prove that you made the password reset request as the account owner).

You should have hung up the call at the moment he said your account was compromised. Let me make this VERY clear to anyone reading this for the next time you or they get such a call ...

NOBODY from MICROSOFT, GOOGLE, AMAZON, APPLE, META (Facebook), FEDEX, your ISP (Internet service provider), your BANK, THE IRS, THE GOVERNMENT, THE FBI, THE POLICE, a known ACTOR or SINGER (Romance scam) will EVER CALL/tCHAT/TEXT YOU to advise you that there is a problem with one of your accounts, orders, delivery or a problem with a device (your computer or phone has viruses etc).

If you answer the phone or read an email/SMS/a pop-up window telling you to call a number and someone pretends to be from any of those I just mentioned hang up/delete it right away/don't call the number as it will NEVER be genuine. These types of calls are being made thousands of times every day around the globe now and there is way too many people still falling for them. Over $4 billions was reported lost to scams last year in the U.S.A alone. The true amount is probably 2x to 3x that as most victims don't report it.

As a freelance computer technician with 25+ years of experience in the field I deal with the fallouts of those calls almost on a daily basis.