I have a small application on Python with PyQt6.
Trying to set an icon with

app.setWindowIcon(QIcon('uiapp.ico'))

without any success. It sets window icon but the taskbar icon remains unchanged.

I also tried adding

import ctypes
myappid = 'mycompany.myproduct.subproduct.version' # arbitrary string
ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(myappid)

from this answer, but this did not help as well.

Also I tried png icon with no success.

Icon size is 128×128. I am using Windows 11 23H2, Python 3.10.11, PyQt 6.7.0.
Running application in Poetry 1.8.3 venv if this does matter.