You can easily verify whether or not the card is the problem by pulling it and using your HD530 IGPU to make the same test. (Though being able to get the Windows option to work essentially says the same thing, that the card is okay, that something else is wrong.)
AirDrop not working says something is not configured correctly and so macOS cannot find the means to tunnel its signal out. The most obvious places to check are ethernet, wifi, bluetooth and firewall and then router.
Nothing wrong with my network - everything else is fine - this machine is fine in windows, just not MacOS.
Without AMD GPU works fine.