.CN Validation can be a bit tricky as all information on the documentation must match exactly with the contact information assigned to your domain. If you are unable to upload your documentation please take the following steps:
Access you domains contact information and ensure that all information matches EXACTLY
Domain contact information
Also, ensure there are no special symbols and that all formats match as well. For example, if you have a postal code of 2xqf 3fg and it is shown as 2xqf3fg on the domain contact section be sure to update to 2xqf 3fg to include the space.
If the above does not seem to help please contact our 24/7 customer support line and our representatives will be happy to address the issue promptly.