Thanks @JoyHawkinsIf it is the first time you've requested the postcard, request a second one. If you've already had multiple postcards not arrive, you can get in touch with Google about verification issues via this form: Sign in - Google Accounts
Thanks @JoyHawkinsIf it is the first time you've requested the postcard, request a second one. If you've already had multiple postcards not arrive, you can get in touch with Google about verification issues via this form: Sign in - Google Accounts