MY KEY HAS BEEN ENABLED WITHOUT MY CONSENT

I logged into my account after several days and, while checking the keys I still have available to activate, I was surprised to find that the key for this game had been enabled without my consent.

I don't think I've been hacked because this is the only key that was enabled without my permission. I was planning to give the key away, but since it's enabled, the option no longer appears. I'd like my key to remain disabled because I don't want to give it away or activate it yet. Could you please provide a solution to my problem?