This was discussed in your previous post Carlos Deviceid function of the phone manager extension no longer returns the id - #2 by jis
It is not possible on devices higher than Android 9 to use an extension like the Phone Manager extension to get the device id (or possibly any device at all), probably due to Google's latest security protections.
Carlos_Andre:
I need to read the serial number.
it is unfortunately not possible anymore starting from Android 10
Taifun