Same issue just arose for me but got 2 emails from different IPs. Master password only stored in my head and is completely unique. Master pre-dates 2017. I have only used LP on my one PC and the phones I have used over the years. The only device I do not still have in my possession is one that I traded in 3 weeks ago for new device (I wiped the trade-in).
Location UNITED STATES
IP address 198.23.179.27
Location Frankfurt am Main, HE 60313, GERMANY
IP address 168.81.130.131
Location UNITED STATES IP address 198.23.179.27
Location Frankfurt am Main, HE 60313, GERMANY IP address 168.81.130.131