The content on the PlayStation®Store is tailored to the region and country that you live in. This is influenced by your IP address and the settings of your PlayStation®Network account. If you are having trouble with the Metal Gear Solid 1 voucher, it is most likely that the cause is a conflict between your game voucher and your PlayStation®Store region. For example, if you have an imported disc your voucher may well be incompatible with the store that you are trying to use it on.
Always make sure that you are purchasing the correct version of the game for your region. Please contact the retailer that sold you the collection or PlayStation®3 customer support, for more information. Remember, the European version is now available!
In case you bought a second-hand copy of Metal Gear Solid : The Legacy Collection, please be aware that every code is connected with a PlayStation®Network account upon the first activation. Because of that, you will not be able to connect your code with another (your) PlayStation®Network account and therefore will need to purchase a new code in the PlayStation®Store.