Before launching the G Suite trial on your domain, you need to verify it.
What do you need?
The login to the Administrator Account (you should have received the credentials by email after registration).
Your domain DNS records access (it is necessary to add a TXT record). Ask your domain provider for the details.
What is the procedure?
Enter your Administration Console via the following link https://admin.google.com and log in with your Administrator Account and password.
After logging in to the Admin Console, approve the G Suite delivery contract.
You will be asked to change your password and to accept other terms and conditions.
Click the blue button - “Run the Setup Wizard”.
After that, click the “Verify the Domain” button.
Confirm the process by clicking “Start Verifying”.
Pick your domain provider from the drop-down menu. If you can't find your provider on the list, pick “Other”.
Create the DNS (Domain Name System) record according to instructions. Google will be provided with the evidence of your domain ownership.
Add the displayed TXT record to DNS configuration for your domain.
Click the “Verify” option on this page.
Once Google receives this DNS record, your ownership will be verified. (Note: Changes in the DNS system may take some time. If the record in not found immediately, Google will make regular attempts to get it. We kindly ask you to be a little patient.) A detailed tutorial on how to add a TXT record can be found in the Google Help Center. If you wish to remain a verified owner of the domain, do not delete the DNS record, even after successful verification. Adding this record has no effect on your incoming messages flow or on any other function.
Learn more here: https://support.google.com/a/answer/60216
If you are still experiencing difficulties, don't hesitate to contact us here.