The HDHomeRun will attempt to automatically scan for channels the first time it is connected to power, and will occasionally do a background scan every few days, but you may still need to run an initial channel scan.
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Make sure you have granted the HDHomeRun app permissions to access your local network. Go to the Settings app → scroll down to “Apps” → “HDHomeRun” → make sure “Local Network” is turned on. If the HDHomeRun app is not listed there, then try deleting/uninstalling the HDHomeRun app and then reinstalling it from the App Store. Be sure to select the option to allow access to the local network, when opening the HDHomeRun app after installation.
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