Panic Button: no idea don’t have Panic on my Xfinity keypad
Sounds: in no particular order
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Verify you are using the suggested DTH https://raw.githubusercontent.com/miriad/Centralite-Keypad/master/devicetypes/mitchpond/centralite-keypad.src/centralite-keypad.groovy
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Follow instructions at paragraph Xfinity/Iris/Centralite Keypad TroubleShooting in this thread link
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In the ST Phone app go to My Home–>keypad device–> tap gear on top right; make sure beep is at least 10 seconds–>go back one screen–> tap the sound icon. No sound: try instructions in prior paragraph