What they are trying to do is get you to give them the pin number so they can claim your listing, making them the owner of it.
No way. They will control your account if you do that. Use the code yourself and you will be tho sole owner. Dead easy to do it yourself and it’s FREE !
If you list your business on the actual Google Business page, you will get hard copies of stuff in the mail with codes where they will then ask you to confirm it online. I had 1 call from them (Google actual) and they referenced the stuff I had gotten in the mail from them, along with the sticker for the window of the business.
EN