On your Android device:
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Go to your Settings > Apps (or Apps & Notification on some devices) > Your Phone Companion.
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Tap Force Stop.
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Tap Storage > Clear Cache > Clear Data.
On your PC:
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Open your browser and visit accounts.microsoft.com/devices/android-ios. Sign in with your Microsoft account.
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You’ll be presented with a list of all your connected devices. For each, select Show details > More actions and then Unlink this phone.
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Select Start (or press the Windows logo key on your keyboard), then select Settings > Phone > Unlink this PC.
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Select Back to return to Windows Settings Home, and then select Apps.
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In Apps & features, select Your Phone.
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Select Advanced options > Reset.
Once these steps are completed, go to the Your Phone app on your PC and follow the set-up process to establish a new link.