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Test the app on two devices

I created a messaging app and could release APK file of it. I am trying to test it now. Now I have installed the app on two devices and I wish to connect the users on those devices so they can chat and call. However, no way I can add one user to the contact list of the other user. I can see both users have joint the app but they do not find each other. I have chosen no login requirements for my app. Can you tell me what is wrong with my app? Why my app does not connect to the host so users add each other using QR bar code? Or created link? What can I do to fix this problem?
Thank you.