Sync your account again once the guest pass expires. That might work.
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Since last Valve changes about that, games being played during trial period are forever attached to your "all games" list as if you own them already. Even after the end of free playing time (passes, free weekend, etc.). Therefore, sync system thinks you own them and so you are unable to enter. All blame to Valve.
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I recived a guest pass for Nuclear dawn, synced my account and now it won't let me enter nuclear dawn giveaways! Why is that? I don't have the game, only a guest pass.
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