新购入了终身卡，但是key无效，求助。

收到的邮件内容是

Hearthbuddy Key Purchase

发件人：Hearthbuddy Shop <purchase@honorbuddy.com>
(由 dmn2@ns3436142.ip-46-105-108.eu 代发)

时 间：2015年10月23日(星期五) 下午5:12 (UTC+02:00 赫尔辛基、开罗、雅典、伊斯坦布尔时间)
收件人：
S‖axe <verker@qq.com>
Greetings Buddy,

This is your Hearthbuddy Key: 2Qxxxxxxxxxxxxxxxx1W

Please put this Key on the Login Window of Hearthbuddy, this Key has 1 Sessions and lasts 3600 Days from the time of first use.

This Key is attached to your email address (which was used on the Gate2Shop Checkout Page), you can see your keys online at www.buddyauth.com once registered there using the same email.

输入key提示如下：

there was an error authenticating your key with the server
please try again or use a different key

invalid product key


请问怎么办？

 

你是要购买哪个辅助的key,你这个key是炉石传说的