Installing Tazmota on Sonoff POW

Installed Tazmota on Sonoff basic switch and it works flawlessly. Used Arduino IDE to flash it.
When doing the exact same thing with Sonoff after completing the flash, I powered the Sonoff POW using mains. The blue internet led on the POW didn’t blink and was off. However I managed to log into the unit (192.168.4.1) and inserted the SSID and password. Restarted the POW and logged into it thru the network (using the new assigned IP). Chose the POW Model from the Tasmota configuration. Can see all the parameters. Still the blue led on the POW is not working. I can toggle on/off from the Tasmota menue, but when adding it to HA it doesn’t stay on when I use the frontend to turn it on (reverts back to the off state).
However, when I press on the mechanical switch on the POW itself, it turns on and the act is being reflected on HA frontend. Would be happy to hear recommendations on what went wrong