Apex Legends No Servers Found: How to Tell if Apex Legends Servers Are Down

Apex Legends "No Servers Found" as a message can seem more apocalyptic than it actually is. Rather than indicate that all the Apex Legends servers have mysteriously disappeared, this error more typically means the servers are offline temporarily for maintenance of one kind or another. Here's what you need to know about the error message.
We are aware of an issue causing the Event Store not to show properly and are actively working to fix it. We'll keep you updated here once we have more information.
— Apex Legends (@PlayApex) April 7, 2020
Apex Legends No Servers Found: How to Tell if Apex Legends Servers Are Down
Apex Legends will occasionally undergo server maintenance, usually when developer Respawn Entertainment is making some change or addition to the game itself. Players can usually verify that maintenance is taking place by checking the official Apex Legends Twitter account for information about updates.
To check the status of Apex Legends' servers, check Downdetector. This website crowdsources reports of inability to connect to detect outages via mass reports. It is reliable for figuring out if servers are experiencing large outages, but won't explain the cause of the problem. For that you'll have to rely on updates from Electronic Arts or Respawn Entertainment.