Suspicious notification from "Find My Mobile"
Samsung probably wanted to quickly refresh their internal user locations database ;)  

https://twitter.com/SamsungHelpUK/status/1230430326687780865  


  @SamsungHelpUK
  
  Recently, a notification about “Find My Mobile 1” occurred on a limited number of Galaxy devices. This was sent unintentionally during an internal test and there is no effect on your device. We apologize for any inconvenience this may have caused our customers. ^LF


http://www.google.com/search?tbm=nws&amp;q=find+my+mobile  

edit: against some news, this notification was not the result of a Samsung data breach.  

https://www.sammobile.com/news/samsung-data-leaked-mystery-find-my-mobile-notification


  Samsung has clarified that, while a data breach did happen around the same time, it's not related to the “Find my Mobile” notification. this technical error affected only Samsung's UK website and it only affected about 150 users in total.