When I try to verify our domain from the admin console, I got the alert shown in the attached image, and the process failed. The alert message gives no indication of the cause. What should I do to resolve this issue?
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Hi
Since you're encountering an issue with domain verification, please submit a ticket to our Product Support team for further assistance.
When submitting the ticket, make sure to use the current primary admin’s email and include written permission to add your domain. You’ll also be asked to provide proof of domain ownership.
Once submitted, our Product Specialist will assist you in adding the requested email domain to your list of claimed domains.
If you have any other concerns, feel free to reach out. We look forward to resolving this for you soon! 
Hi
Actually, before posting my question, I visited the page you provided , but I was prompted to post to the community instead, as shown below. How can I get to the page where I can submit a request?
Dear
The available support channels can vary depending on the type of account. It’s possible that your account hasn’t yet reflected the current support options when you signed in to our support page. For clarity and future access, we can also raise this to our support team to verify your channel availability.
To assist you further, I’ve gone ahead and created a support ticket on your behalf. You should receive an email shortly containing your case number. One of our Product Support specialists will reach out via email with instructions, so please keep an eye out for their follow-up.
In the meantime, if you have any other questions or concerns, feel free to let us know. 
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