I have had the exact same issue.
Wargame EE disappeared from the game list wirthout any kind of expalanation.
I contacted steam support and got the following statement:
"Thank you for contacting Steam Support.
Your CD Key for this game has been revoked at the request of the publisher.
You will need to contact the seller for further assistance.
Let us know if you have any further questions or concerns."
So I have emailed 'firstname.lastname@example.org
' as advised in this thread.
Any indication how long it takes to get a response?
I find it unbelievable that paying customers get so much trouble.
Random game revocation, the activation joke and the rebranded starforce, this is really over the top.
I contacted my reseller for a refund as I am not sure I want to return to the game.