The first check is to confirm the input is still active. Also try a second phone/iPad assuming you have access to one. If everything is set up correctly I would try a reboot of the streamer.
It’s funny, but some years ago I switched from an iPhone to a Samsung Galaxy.
It would NOT connect to my Mini JCW Roadster. I took the car to the dealer and had all the Software/Firmware updates done, which cost hundreds of £’s and still it wouldn’t work.
I checked the internet and discovered that people the world over were having problems with Samsungs Bluetooth system with the new Galaxy phones.
I have had similar problems with a Samsung TV and wireless connectivity. I now no longer by Samsung products, with the exception of Washing Machines, which are brilliant…
I realise this doesn’t answer the question, but is there anything that works with Bluetooth that doesn’t also work with AirPlay and/or Chromecast, and almost certainly more reliably?