If you've bought a Gmail account and have never bought an account before and don't know how to properly sign in to your Google account, before you contact tech support, take a look at this instruction to make sure you've done everything right.

You should not use any VPN, as they are often full of holes and google does not like it.
Do not log in with your native ip if you purchased more than 1 account.
Don't use free/general proxies.
These are all triggers for google.

To log into google accounts, you must use quality private proxies that are not in spam databases.

Next is the login itself.

If you have a google account with additional mail/backup mail. You do not need to log in to the backup Google account to get the code, you just need to specify the very same backup email.

It's very simple!

If you purchased Gmail with a phone number in your profile security, do the same thing as above, only instead of extra mail, you have a backup number.

That's all.

If you have Google at login asks to accept sms to phone number, which tied to google accounts (google account with phone number in safe profile)

See the beginning of the post.

Change proxy, device/browser.

Google may give out such a thing only if it does not like something, your proxy, vpn (if you did not stick to the recommendations, and made on their own).

If you use 1 proxy for several accounts (mobile proxy is not taken into account) and the same device/browser.