Unknown pop up

Today I was using my phone as normal and received a pop up that read “The location of this iPhone can be seen by its owner 'j•••••@gmail.com”. This is not my iCloud account and I have no email addresses beginning with J. I have looked in my settings and I have no unknown devices and my iCloud is still linked.

Could this mean my phone is hacked??? I turned off location settings just in case. I got the phone brand new and it has never been out of my sight for someone to login to.