When the Azan does not play

Confirm the device is not muted, that the correct prayers are enabled, and that the schedule has not been paused by a quiet-hours setting.

A paired Bluetooth speaker in another room will silently take the audio with it. Unpair to test, then re-pair deliberately.

Power-cycle the device before resetting it. A factory reset usually erases your city and method and creates a second problem.

If you are using a browser clock, audio needs a tap on the page first and stops when the tab is closed. That is a browser rule, not a fault.