Bootcamp for windows 10 doesn't work properly.

When I use bootcamp on any macOS (Sierra or newer, I've tried it on Sierra, Mojave, and Catalina this week), it installs Windows 10 just fine, but the windows I have installed has no internet or sound. This is a pain because it's been happening for around 6 months now, ever since the Mojave update. I've tried the ISO's in a Virtual Machine and they work perfectly with sound and internet. It's when I use bootcamp to run windows that I get this issue. I've talked with chat support around 10 times about this, and there was no help I could find. Bootcamp doesn't even work on Catalina because Catalina creates Split-Fusion drives. These aren't compatible with Bootcamp.

This leads me to believing that the support software is outdated and/or corrupted. There is not even any windows 10 support software that I can download on apple's website.

Any help would be appreciated.