Update = Issue was solved by reinstalling the RealTek 6.0.9247.1 A09 driver.
Headphones Sony wh-1000xm3 is connected/paired via Bluetooth with my Latitude 5520, but the headphones are not shown as audio device/option?! All sound drivers are up-to-date. So I don't get my headphones to work... recommendations are very welcome!
Headphones Sony wh-1000xm3 not working on Latitude 5520 (Windows 10)