Hello there! I'm glad to help you today!
You basically have done almost everything considering your list. I'm also assuming that you have downloaded your Bluetooth drivers in this link https://www.gigabyte.com/Motherboard/X870E-AORUS-MASTER/support
Windows Bluetooth is… finicky, especially for audio, so I would highly suggest getting an external USB dongle. I also have this problem personally (I have a variety of Bluetooth audio e.g Airpods Max, airpods pro 2, Ifi audio go pod, fiio etc.) and not all of them work on my built-in Bluetooth adapter.
Any External Bluetooth adapter beyond 5.0 should suffice. Image reference (Even the ones without an Antenna should be fine)
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install.