If you are receiving an error and not able to validate your DNS here is a quick item you can do to troubleshoot.
Depending on you DNS provider you may need to remove your domain from the host entry (unfortunately DNS providers treat these all different and not standardized). Here are a list of the known providers you'll need to follow these steps for:
Remove the .yourdomain.tld from the three separate records on the host entry.
EXAMPLE: In the example below, the domain I am trying to verify is klowdcompanytest.com
I would remove the .klowdcompanytest.com from the three different DNS records in my DNS. Make sure to also to remove the leading "." This means that
Once you have made those changes in your DNS and allowed them to propagate, try validating again. If it still fails, give support a chat here and we will continue to help troubleshoot.