"Someone just used your master password to try to log in to your account from a device or location we didn't recognize. LastPass blocked this attempt, but you should take a closer look."

Could be... I haven't rotated my password in a while. Could you link me to more info about the LastPass compromise that you mentioned?

p.s. My master password is definitely not dictionary material, and it's not used anywhere else, so I am 100% sure it's not a bruteforce / phishing attempt.