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Replacing UUID to a custom value in nRF Toolbox

Hello. I am trying to change the UUID value of a service and characteristic of my nRF52 to have a custom value. I have successfully done this in firmware and it has been found in nRF connect as expected. The device is setup to work with the HRM mode in the nRF toolbox. I tried going in and changing the HR_SERVICE_UUID and HEART_RATE_MEASUREMENT_CHARACTERISTIC_UUID to match the new values but when i click scan inside the app i can no longer find the device.(nRF connect sees it fine) Is there more I need to do to pick up the device when scanning?

Note: assume everything else has not changed one iota to keep this scientific. 

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