If you are currently staring at a browser tab with g.co/verifyaccount loaded, follow this workflow exactly.
To give you the best advice for your situation, could you tell me:
You clicked "Forgot password." After you request a reset link, Google sends you to g.co/verifyaccount to prove you are the original owner (often by entering a code from a previous trusted device). g.co verify account
Verify it's you when you complete a sensitive action - Google Help
"Google: Someone is trying to access your account. If this wasn't you, verify your identity immediately at ." If you are currently staring at a browser tab with g
Closing the tab resets the verification timer. You will have to start over.
“Invalid code. Try again.”
Owners of brick-and-mortar stores or service-area businesses often need to verify their phone number or postcard address. The phone verification step sometimes routes through the same g.co verification system.