Android - geturiforfile - failed to find configured root error.

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Android

Trying to take a photo using "cameraIntent" (with MediaStore.EXTRA_OUTPUT and a URI). To facilitate secure sharing by creating a content://uri instead of a file:///uri, and have secure permissions I use "FileProvider.getUriForFile" and this is returning "Failed to find configured root that contains "/CL-Shopping.jpg"

Here's the steps I have taken.
1. Android Manifest... (Inside the application tag of course)

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="${applicationId}.provider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/provider_paths" />
</provider>

2. From the above we need provider_paths...
(Here I have tried "external-path" AND "external-files-path" AND "files-path"

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="files"
        path="/"/>
</paths>

3. Then - I attempt to get the URI...

try {
    val fName = "CL-$lName-$item.jpg"
    val dir = ""
    val newFile = File(dir, fName)
    val auth = BuildConfig.APPLICATION_ID + ".provider"
    val fUri = FileProvider.getUriForFile(context!!,  auth, newFile)

    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, fUri)
    startActivityForResult(cameraIntent, 1001)
}
catch(e: Exception){
    val x=""
    val y=""
}

Breakpoint on the exception gives.
java.lang.IllegalArgumentException:
Failed to find configured root that contains /CL-Shopping-Potato Sticks.jpg

Obviously that's my filename and obviously it can't find the directory that
it's supposed to be in.

With a breakpoint on the getUriForFile, I can see that the variable "auth"
does have the application provider full name "com.example.missioncontroller.provider"

Please could anyone advise - thanks

What I have tried:

Have tried adding directory "files" which is seen as a directory under the com.example.missioncontroller directory...
Have tried several variants in the provider_paths file (all individually)
<files-path>
<external-path>
<external-files-path>