Hello, Lukasz Polok1
Welcome to Microsoft Community.
I’m sorry to hear about the issue with your Microsoft Sculpt Ergonomic Keyboard’s Bluetooth receiver. Unfortunately, the Microsoft keyboard and its USB dongle are paired and will only work with each other, so the dongles are unique and come as a set. This means that a replacement dongle might not be possible to get. That is, Replacing the entire keyboard is a suitable solution.
However, you could try reaching out to the Microsoft Supplemental Parts team or the Microsoft Store Support. They might be able to provide further assistance or suggest alternative solutions. If you’re unable to get a replacement for the dongle, you might need to consider replacing the whole keyboard. See the following contact entry of Phone support and the Chat Support:
Global Customer Service phone numbers - Microsoft Support
Contact Us - Microsoft Support
Click the PC accessories and Log in to your Microsoft account and follow the on-screen instructions to enter the online support window.
I hope this information helps! If you have any other questions, feel free to ask.
Best regards,
Chandy |Microsoft Community Support Specialist