When you pair Priva with a receiver, you need to plug in the 3.5mm cable to turn Priva on.
But no need for Priva to connect to any audio device now. You can pair it with the receiver first. Once paid and connect, you can then plug it into any audio device you want to stream the music out, such as TV, PC, Hifi, etc.)
When you put Priva and your receiver both in pairing mode, if any of them goes out of pairing mode first, leaving the other device in pairing mode, it means the left device is taken by other device in the household. Pls check and turn that device off.
If still no luck, you can reset both device and try again.
This will solve nearly all the problem.