Big Sur does not work with Bluetooth

My Bose Headsets will connect to my iMac for about 6 seconds, then disconnect.

2019 Imac

What I've tried but does not work:

Chat with apple support

Turn on and off BT

Reset the BT module

Remove all BT devices

Reset Bose Headphones removed all other BT devices it stored

remove all peripherals except keyboard and mouse

Reset NVRAM

Reset SMV

Tried connecting without any peripherals

Tried connecting with all other devices in the building shut down.

Connected headphones to other devices like my iPhone, a Windows laptop, all have 100 percent connect and function rate. including a little Raspberry Pi.

Tried connecting with a Logitech 800 headset that also connects to all the other items.

At some point, it has to stop being my fault.

I have come to the conclusion that Big Sur has an issue with Bluetooth, does not function with other than the wireless keyboard and mouse, and that there is nothing left for me to do to make it connect. It simply doesn't work.

Since my bluetooth headphones are mission critical for me, there is no other option than restoring the previous and functioning version of MacOS, and continue working rather than trying endless dead end tricks that repeat the original problem to get it to function.

I'll revert and hope that Apple gets around to fixing this problem.

Bummer