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I'm sorry to hear that you're being prompted for an activation key when launching Assassin's Creed IV: Black Flag. Crust_Thug has provided steps on how you can find your CD keys within Steam. Were you able to locate the activation key required using these steps?
I would also recommend checking out this support article[www.ubisoft.com], which provides more troubleshooting suggestions for when Steam asks for a Ubisoft Connect PC key.
If you're still having trouble launching the game after trying these steps, please don't hesitate to share an update with us within this thread so we can investigate further.
Thanks,
- Ubisoft Support
Ubisoft you make me want to kill myself for making this process so difficult.