This was an issue that was occurring after the migrating with new Androidx migration. The root cause was the android.support.v4.content.FileProvider was not provided in the latest android support library.

To debug this error you will have to see the adb log with the command

adb logcat

The issue will be visible for you as following in the log

12-19 09:29:21.936 20340 20340 E AndroidRuntime: java.lang.RuntimeException: Unable to get provider android.support.v4.content.FileProvider: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.content.FileProvider" on
path: DexPathList[[zip file "/data/app/com.foo-ZEEUwKWVlwMF6G0KnwUxrA==/base.apk"],nativeLibraryDirectories=[/data/app/com.foo-ZEEUwKWVlwMF6G0KnwUxrA==/lib/x86, /data/app/com.foo-ZEEUwKWVlwMF6G0KnwUxrA==/base.apk!/lib/x8
6, /system/lib]]
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at android.app.ActivityThread.installProvider(ActivityThread.java:6396)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at android.app.ActivityThread.installContentProviders(ActivityThread.java:5938)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5853)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at android.app.ActivityThread.access$1100(ActivityThread.java:199)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:106)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:193)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:6669)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
12-19 09:29:21.936 20340 20340 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

You can get around this issue by finding the relevant code line from the AndroidManifest.xml file

        <provider
            android:name="android.support.v4.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>

First, comment out this and see whether that error is gone from your app. Then if it’s good, you can remove it forever and run the project.

Checkout following on how to setup FCM push notifications with react native app.

How to setup FCM Push Notification with React Native App