Android APK Build Failing "Execution failed for task ':launcher:checkReleaseDuplicateClasses'."

There's a character count limit so here's what I can put:

CommandInvokationFailure: Gradle build failed. /Applications/Unity/Hub/Editor/2019.3.7f1/PlaybackEngines/AndroidPlayer/OpenJDK/bin/java -classpath "/Applications/Unity/Hub/Editor/2019.3.7f1/PlaybackEngines/AndroidPlayer/Tools/gradle/lib/gradle-launcher-5.1.1.jar" org.gradle.launcher.Gradle$$anonymous$$ain "-Dorg.gradle.jvmargs=-Xmx4096m" "assembleRelease"

stderr[

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':launcher:checkReleaseDuplicateClasses'.

  1 exception was raised by workers:

  java.lang.RuntimeException: Duplicate class android.support.v4.app.INotificationSideChannel found in modules classes.jar (:androidx.core.core-1.0.0:) and classes.jar (:com.android.support.support-compat-26.1.0:) Duplicate class android.support.v4.app.INotificationSideChannel$Stub found in modules classes.jar (:androidx.core.core-1.0.0:) and classes.jar (:com.android.support.support-compat-26.1.0:) Duplicate class android.support.v4.app.INotificationSideChannel$Stub$Proxy found in modules classes.jar (:androidx.core.core-1.0.0:) and classes.jar (:com.android.support.support-compat-26.1.0:) Duplicate class android.support.v4.media.$$anonymous$$ediaBrowserCompat found in modules classes.jar (:androidx.media.media-1.0.0:) and classes.jar (:com.android.support.support-media-compat-26.1.0:) Duplicate class android.support.v4.media.$$anonymous$$ediaBrowserCompat$CallbackHandler found in modules classes.jar (:androidx.media.media-1.0.0:) and classes.jar (:com.android.support.support-media-compat-26.1.0:) Duplicate class android.support.v4.media.$$anonymous$$ediaBrowserCompat$ConnectionCallback found in modules classes.jar (:androidx.media.media-1.0.0:) and classes.jar (:com.android.support.support-media-compat-26.1.0:) Duplicate class android.support.v4.media.$$anonymous$$ediaBrowserCompat$ConnectionCallback$ConnectionCallbackInternal found in modules classes.jar (:androidx.media.media-1.0.0:) and classes.jar (:com.android.support.support-media-compat-26.1.0:) Duplicate class android.support.v4.media.$$anonymous$$ediaBrowserCompat$ConnectionCallback$StubApi21 found in modules classes.jar (:androidx.media.media-1.0.0:) and classes.jar (:com.android.support.support-media-compat-26.1.0:) Duplicate class android.support.v4.media.$$anonymous$$ediaBrowserCompat$CustomActionCallback found in modules classes.jar (:androidx.media.media-1.0.0:) and classes.jar (:com.android.support.support-media-compat-26.1.0:) Duplicate class android.support.v4.media.$$anonymous$$ediaBrowserCompat$CustomActionResultReceiver found in modules classes.jar (:androidx.media.media-1.0.0:) and classes.jar (:com.android.support.support-media-compat-26.1.0:) Duplicate class android.support.v4.media.$$anonymous$$ediaBrowserCompat$ItemCallback found in modules classes.jar (:androidx.media.media-1.0.0:) and classes.jar (:com.android.support.support-media-compat-26.1.0:)

I am seeing the exact same problem. From my research something is pulling in a non-AndroidX version of that class. The jetifier is supposed to fix those to all use AndroidX but for some reason it's not. But sorry, I have not solved it yet.