you have an alert from steam support .
This account may have been accessed by someone else.
Steam Support suspects your account may have been accessed by someone else. We are temporarily restricting modifications to this account as a security precaution. Please contact Steam Support so we can assist you.
How to regain access to your account:
Contact Steam Support and a support agent will verify that you are the owner of the account and restore account access to you. You may be asked to provide proof of purchase for games on the account or proof of ownership of the payment method.
More information is available here: Reclaiming a Hijacked Steam Account FAQ
This account will have restricted functionality until the owner has regained access.
Purchasing, gifting, trading, cd-key activation, and Steam Community access have been disabled.
Probably your steam account has been stolen. Whether you bought it online, so, I guess you'll never get it back. However, whether you have the CD-KEY, you'll have to take a picture of that and send it to Valve, at least that was what I did when I got hacked.
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