How to disable default App Chooser in Firebase Invites

Question

I am working with the sample code here to integrate Firebase Invites into my app: https://github.com/firebase/quickstart-android/tree/master/invites

The sample works as expected, when I click on the Invite button, I receive a screen where I can select the recipient of my invite. See image.

However, when I add the exact same code to my app, after clicking the invite button, I receive a native Android chooser which let's me decide what app should perform this action. See image.

If I dismiss this chooser, I am then taken to the expected Invite screen where I can choose the recipient.

What I am wondering, how do I get rid off that default app chooser. There must be something in my app (even though I think the code is the same as the sample) which causes the chooser to appear.

any ideas? thanks

EDIT:

public void onInviteClicked() {
    Intent intent = new AppInviteInvitation.IntentBuilder(getString(R.string.invite_title))
            .setMessage(getString(R.string.invite_message))
            .setDeepLink(Uri.parse(getString(R.string.invite_deep_link)))
            .setCustomImage(Uri.parse(getString(R.string.invite_custom_image)))
            .setCallToActionText(getString(R.string.invite_cta))
            //.setEmailSubject("subject of email")
            .build();
    startActivityForResult(intent, REQUEST_INVITE);
}