After trying Add a custom app module to the Field Service (Dynamics 365) mobile app | Microsoft Docs and failing multiple times, with error message of bad XML, I starter getting curious. So here is my solution Create a solution and include your Model Driven App Export solution and Extract customization.xml file Locate the <AppModule> node Add the following Xml <appsettings> <appsetting uniquename="{name of your App with prefix}_ChannelAvailability"> <value>{name of your App}</value> <iscustomizable>1</iscustomizable> <displayname default="App channel availability"> <label description="App channel availability" languagecode="1033" /> </displayname> <description default="Default Description."> <label description="Description." languagecode="1033" /> </description> <settingdefinitionid> <un