How to view the product serial number has been used

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Lost my uplay account mailbox, I need a related product serial number to prove I am the owner of this account, but I can't in the attributes of the product to find the serial number, I to apply for customer service to send but it will take time, my product is obtained through online shopping and it is in the form of gifts sent to my Steam account. I can't through the warehouse of gift to view sequence number, I should what to do in order to get the serial number of the product (the serial number has been used)

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I readly need help

[Tev]

You can view Uplay CD-keys by clicking the [CD Key] -button on the right under links when viewing the game on your Steam -library. If it's downloading or installed, you can also view it by right mouse clicking the game -> [View CD Key]

P.S. Selling Steam Gifts is against the EULA. So if you've bought a gift via third party websites, they've likely been unauthorized resellers too.

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what ? p - p

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How can I find the CD-keys option

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My English is not good, so I need some simple words.

[Tev]

I'm going to save myself some time and just show a screenshot.
http://imgur.com/U2JVEvu.png

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If I right click on my product, it only install the game) (see DLC) (see news) (browsing community center) (view the forum) (see Community Guide) (written evaluation) (add to favorites) (classification) (attributes) of these options

[Tev]

Then you don't have the game installed (or in the middle of being installed.)

Check the [CD Key] on the right under links.

Which game is this anyway?

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Rainbow six - siege

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Last night I did not have to delete this product, I can not find the serial number option

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I am using the Chinese Steam client, I can not find the right key options in view of the serial number of the project

[Tev]

Originalmente postado por Now join the KFC luxury packages:

Rainbow six - siege

Yeah, I should've checked your profile.

Have you linked your Steam -account with your Uplay -account? Going by the forums, indeed not everyone has that button: http://steamcommunity.com/app/359550/discussions/0/366298942097909303/

Originalmente postado por Now join the KFC luxury packages:

I am using the Chinese Steam client, I can not find the right key options in view of the serial number of the project

But you have the game installed?

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Why not everyone can see their serial number, no matter how to say, thank you for such an enthusiastic answer

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Game I was removed this morning, yesterday evening can play, but accidentally quit the uplay account before I found my registered mail is wrong

[Tev]

Originalmente postado por sinai:

If you see a window in Uplay that asks you for a cd-key then your uplay is out of date. Don't know why it hasn't auto updated but it should and does for the majority of users out there.

Find a way to update it and make sure there isn't a UbisoftGameLauncher.exe running before you do.

There are no cd-keys for siege now after the new uplay update.

Since updating the Uplay -client gets over that activation window, I'd presume the CD-key is no longer used and thus the lack of visible key would suggest it'll be hard to use as proof at Uplay.