Buy Domain
When Google My Business had the option to buy domain, I purchased one for my website — it disconnected after a couple days, so I contacted them and this is how they responded.
"We are sorry for the inconvenience caused. We suggest you to try to look for a 3rd party web host that will cater to your needs to setup a website that can be mapped to your domain name." —Raajal
I dont understand why they ask you to get a website address that reflects your business with a custom domain, if they dont really offer that service.
After attempting several times, I turned to Google Domains — they were able to forward but not mask my domain.
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Google My Business, v2.26.0