Launching NextGIS Mobile from ODK Collect

I would like my ODK form to include the ability to launch the NextGIS Mobile app and have setup the form to include the following line:

<input appearance="ex:com.nextgis.mobile.MainActivity" ref="/ABQ_Form_Tester/r1/g2/gid">

I assumed that com.nextgis.mobile.MainActivity was the correct intent as this is what the Android launcher indicates, but when I tap the launch widget it doesn't open anything. I looked up the manifest and also tried com.nextgis.mobile and com.nextgis.mobile.MainApplication, neither worked. I assume there is something simple I am missing - or is it not possible to launch an app without involving any data passing between the app and ODK?

You can't launch any activity form another app. Please look how it works here: https://github.com/opendatakit/counter/blob/master/app/src/main/AndroidManifest.xml and here https://github.com/opendatakit/breathcounter/blob/master/BreathCounter/AndroidManifest.xml there we have activities with appropriate filters in your case there is only MainActivity.