Certificate Authorities (CA’s) randomly pull certificates aside for additional review from time to time. This does not mean you did anything wrong or that your certificate is invalid. This could also be due to an issue with your domain name. We would advise you to contact your SSL provider, who can contact the CA directly and help get this resolved quickly.

Related posts:

What should I do to expedite the validation of my order? My browser is not showing the green padlock/green bar, why? Who do I send a validation document to? My certificate works in my browser, but my visitors get a Security Alert that says ‘The security certificate was issued by a company you have not chosen to trust…’ What is the problem?