Magic keyboard and track pad or mouse did not work for me with logic board first boot, only a MacBook case with track pad and keyboard worked. Connecting any peripheral over usb on a logic board at login screen will not function due to macos external connected device trust acceptance popup only appears after login.

I also thought so but in my case the keyboard worked somehow. And I had not previously trusted it. Perhaps there was something else I did, but it worked on it's first plug in.