Clash of Clans Community Manager Darian Vorlick posted the above alert in the CoC subreddit warning players about the following.
...We've been monitoring threads on Reddit where recently players have been reporting their accounts being stolen regardless if they had Account Protection or not.
Through Support, we’ve learned that a scam is circulating where persons impersonating Supercell are contacting players and asking for their Supercell ID login verification codes.
We only ask for recovery codes in a support conversation you have initiated. If you are contacted about the codes elsewhere, for example, via email, it's a scam.
For those who don't know, Account Protection is a new feature available since December to many players of Supercell games including Hay Day.