The steps for troubleshooting are as follows: Check to see if you're using the same Microsoft account across both devices. Ascertain that the devices have a robust and consistent internet connection. Check to see if the devices' battery savers are active. If this is the case, disable it because it may interfere with internet connectivity. Turn off the devices' Do Not Disturb settings. Go to Settings > System > Shared experiences to see if Your Phone app can operate in the background on your PC, and if anything prevents the device from sharing across devices.