Unable to connect via Steam account

I was playing the game on my steam account until yesterday.

Today after the update I found myself in front of a LOGIN screen where I am required to type in a e-mail and pass and with no option to link the game to my steam account.

I do have a Gaijin account (I think since beta) but most of my progression was done on the steam account.

How can I fix this?

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Try to restart your PC