I can report similar issue. I’ve had the Nexia HAs for about 6 months and a Streamer 2. The Streamer 2 pairs with the HAs, but the only way to make the connection was through the Smart 3D app. When streaming is available, the devices you can connect to appear at the bottom of the Smart 3D home screen. A ‘Devices Available’ tab would appear and you could choose between three devices.
After the latest app update (3rd week of August?) the Available Devices tab has disappeared.
I contacted Resound tech support and they’ve said my Audi can change a setting so I can make the connection between the HAs and the Streamer 2 with an HA button press, but my audi hasn’t been able to find such a setting for the Nexia.
She’s short handed suddenly and I’m patiently waiting for her efforts to get support from Resound. In the meantime I’m burning through my phone data plan streaming directly from my phone.
If there’s a resolution I’ll post back.