There doesn’t appear to be a dedicated Refresh AirPlay Sources option in Apple Music for Windows. Since the devices appear correctly on your iPhone, try refreshing the Windows app’s connection:
- Quit Apple Music completely and reopen it.
- Restart your PC and the AirPlay speakers or receivers.
- Make sure the PC and speakers are on the same Wi-Fi network, and temporarily disable any VPN that might interfere with local device discovery.
- Check for updates to Apple Music in the Microsoft Store.
If the source names or icons are still incorrect, try Settings -> Apps ->Installed apps ->Apple Music -> Advanced options ->Repair, if that option is available. Repair is preferable to Reset because it is less likely to remove app data.
You can also consult Apple’s AirPlay troubleshooting guide