#include <QCoreApplication>
#include <QAudioSink>
#include <QMediaDevices>
#include <QDebug>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QAudioFormat format = QMediaDevices::defaultAudioOutput().preferredFormat();
    if (!QMediaDevices::defaultAudioOutput().isFormatSupported(format)) {
        qWarning() << "Format not supported!";
    }
    return a.exec();
}

And I get the output:
"Format not supported!"

How is this possible? I'm on Windows 11, Qt 6.8.2, Qt Creator 15.0.1 (Enterprise).
I checked that QMediaDevices::defaultAudioOutput() outputs my device (I listen to music from it in the browser, everything works).
Maybe I somehow misunderstand how QAudioFormat works. But I tried a little bit to manually specify QAudioFormat properties, and it still showed that the format are not supported.