Might be a trolling post as if you go to the Google Play Store and look at the Oticon ON app, it still says:
"Please note
- The ON App for Android will not enable you to use your hearing aids for direct audio streaming from your Android phone."
Or, if you don’t like the Google Play Store as a source of reliable info, one can go directly to Oticon’s website and read this FAQ:
"Q: Can I make phone calls with my Android phone and stream the sound directly into my Oticon Opn hearing aids?
A: No. There is no Bluetooth standard supporting direct sound from Android smartphones to hearing aids at this time."
https://www.oticon.com/support/how-to/opn-wireless-connections/faq#can_i_make_phone_calls_with_my_android_phone