Install Wildard certificate on Forge issued on another server

Hello,

My domain (mydomain.com) and wildcard SSL are installed on another hosting service hosting a Magento installation. I've created a subdomain (laravel.mydomain.com) and set this up on Forge. Now I'm trying to install the wildcard SSL onto Forge for my subdomain, but I can't seem to get it to work. Every time I try, the site breaks.

I've tried installing the certificate, the chain certificate, and both concatenated together with no luck. Any suggestions on how to get this working?

Many thanks,

Sam