Test Flight Availability

It seems Test Flight is unavailable as this is the message I recieve when trying to install my app in Test Flight.

"Could not install ______. TestFlight is currently unavailable. Try again"

Yet, all systems are rosy according to the system status page (https://developer.apple.com/system-status/).

Is this status page updated manually when somebody complains or is it actually testing anything?

Test Flight Availability
 
 
Q