You said they whitelisted the cdn domain I provided. that means that they are probably blocking everything else.
This is a server settings issue that is a huge area and it’s not within our responsibility, but we are trying to help has much as we can.
The only customer we had like this was related to the restrictions that were being applied in the servers, it was never a theme issue.
If can or to install the theme in another hosting or install it locally in the computer to confirm what I’m saying.
-Rui