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Another steam key activation issue


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I purchased A10C from steam last week. Today I installed DCS world to 1.25 and the A10C module (1.25).

When I try multiplayer or any single player option for A10C I get prompted for serial number, I copy paste from steam but get the following error:

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.

Do I need to submit a trouble ticket?

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