Random In Game Warning On Alt Account?

I have my main account which I use everyday for hours and a second account where I’m currently just logging in everyday until today where I decided to finish all of act 2 on the alt account. I then randomly recieved an In game warning telling me that ‘Account sharing’ is prohibited and that they are aware that it is a unfair tactic used in AW. I’m not even in an alliance on my alt account. Anyone know why I could have got a random warning for?
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Comments
It's standard from them