Hello @Aryaveer Chaudhary ,
Welcome to Microsoft Q&A!
The phoneLineTransportManagement capability is required to use
PhoneLineTransportDevice APIs in the
This capability allows apps to manage system devices responsible for phone line connectivity.
You can try to add phoneLineTransportManagement in
Package.appxmanifest like this.
<Package ... xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities" IgnorableNamespaces="uap mp rescap"> ... <Capabilities> <rescap:Capability Name="phoneLineTransportManagement" /> </Capabilities>
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