Thanks for your response! I ran the tool again and tried adding the new domain (demosite.placementpathways.com), I got a "Warning: The domain 'demosite.placementpathways.com' does not resolve, please fix its DNS entries or remove it."
This is a subdomain for my multisite wordpress site. Do you know how I might resolve the subdomain for my DNS? I tried a CNAME record, but obviously that didn't work?
Thanks again for your help.