''Invalid Serial Number'' message when trying to connect

[Forza42]

hello

 

i've already buy DCS A10, FC3 and already play in MP session...a lot...

I ve just buy DCS P51D tonight, install, enter my serial number, flying alone in Singe player .. no pbl

When trying to go into MP session, i have ''Invalid Serial Number'' message when trying to connect :S

 

any help will be very appreciated :D

[Forza42]

OOOOHHHH

 

I ve just see that my serial number into the Email received after order is different as the one into the DCS website O_O

weird ....

how it can be happend ?