Hi.   
Just bought DCS A10C to play inside DCS World. 
When I start DCS World, goto modules->installed modules and click "view serial" I can see the same serial number as written on my "purchases" page on the DCS website.   
However, whenever I try to start a game, I'm shown the A-10C activation application. 
I enter the exact serial number as shown in game or on the website (I've copied+pasted... tried without the hashes.. all caps.. all lowercase.. etc) but whenever I click "Next", I Get the following:     
The system requires the correct serial number of the application to perform this operation. The serial number entered is wrong or mistyped. Enter a valid serial number and try again.     
I've also tried doing the "other" activation and going to that proactive.star-force.com site... I paste in the key and the hardware code. 
However, here I'm told:   
Invalid hardware code. Make sure the serial number used is valid for the product you are trying to activate, generate a new hardware code and try again.     
Not exactly sure how to generate a new hardware code... 
and getting quite annoyed by this whole process    
Also - waited a couple of days for a reply to a ticket on this and got nowhere :/   
ANY advice would be lovely.. 
But, tbh, if I get nowhere by the end of the week, I'll be asking for a refund via PayPal :(