Can a zone be manually activated at the valve using the solenoid/bleed screw. Let’s make sure water is getting to the valves?
Any digging recently? A cut common wire can prevent the entire system from running. If one has access to an ohm meter, disconnect a zone line and the common line and test the resistivity between the two lines - should be in the 25 - 30 ohm range. Infinite resistivity means a cut wire.
Could the zones have been marked disabled in the app?
Can the zones be activated using the buttons on the controller?