For more updates see at [ Ссылка ]
Google updated the bug fix in January 2020, they do not allow adding secondary domain names or changing primary domain names [ Ссылка ]
Using aliases is the only solution for free g suite accounts, I have described in detail the product service.
With alias you can send and receive emails with your domain name
You can refer to the instructions below
To receive and send email with your domain name [ Ссылка ]
Configured for outlook [ Ссылка ]
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Google Apps Free edition (legacy): Change your Primary Domain and Adding secondary domain.
From March 15th , 2016 Google has updated , can not change the primary domain. But I’ve figured out a loophole in Google Apps system to Swap Primary Domain or adding Secondary Domain for Google Apps free account.
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Domains: insert | Directory API [ Ссылка ]
How do I verify my Google Apps domain?
[ Ссылка ]
How to delete your domain's Google Apps for Work account
[ Ссылка ]
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