Add a custom app module to the Field Service (Dynamics 365) mobile app

 

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

1. Create a solution and include your Model Driven App
2. Export solution and Extract customization.xml file
3. Locate the <AppModule> node 
4. 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>

<uniquename>ChannelAvailability</uniquename>

</settingdefinitionid>

</appsetting>

        <appsetting uniquename="{name of your App with prefix}_ServerMode">

<value>false</value>

<iscustomizable>1</iscustomizable>

<displayname default="ServerMode">

<label description="ServerMode" languagecode="1033" />

</displayname>

<description default="Specifies the ServerMode.">

<label description="Specifies the ServerMode." languagecode="1033" />

</description>

<settingdefinitionid>

<uniquename>ServerMode</uniquename>

</settingdefinitionid>

</appsetting>

</appsettings>

Sample:

<appsettings>

<appsetting uniquename="mg_FieldServiceMobileApp_ChannelAvailability">

<value>FieldServiceMobileApp</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>

<uniquename>ChannelAvailability</uniquename>

</settingdefinitionid>

</appsetting>

<appsetting uniquename="mg_FieldServiceMobileApp_ServerMode">

<value>false</value>

<iscustomizable>1</iscustomizable>

<displayname default="ServerMode">

<label description="ServerMode" languagecode="1033" />

</displayname>

<description default="Specifies the ServerMode.">

<label description="Specifies the ServerMode." languagecode="1033" />

</description>

<settingdefinitionid>

<uniquename>ServerMode</uniquename>

</settingdefinitionid>

</appsetting>

</appsettings>

 

Save the file.

Add the customization.xml file in your zip solution file 

Import it back to your environment.