I got the same problem with my IPhone X few days after I got mine update to IOS14 fee week ago. My Bluetooth is not working anymore, they just give me the spin(loading signal) I have tried to reset network, reset setting, I even try System reset or reset phone. But all of its didn’t work, so I have take my phone to the Genius Bar to fix, and after they try all the things I tried, they have decide to run the diagnostic and open my sims case and using the flashlight look inside and they told me that my phone don’t have the Bluetooth module. So they told me that the way to fix is to replace a new one, but I didn’t agree because why did they said there’s no Bluetooth modules when last week before the IOS14 update my Bluetooth work fine, and also after update to IOS14 my phone also work super fine with the Bluetooth which mean that I did have the Bluetooth module