WiFi icon not showing up in MacOS Recovery

So I wanted to run the public beta of MacOS Big Sur public beta, but I didn’t want to install on the main drive so I went though the steps of making a bootable usb installer the went into MacOS Recovery mode to in stall it, but it doesn’t show the WiFi icon where it’s supposed to be well you have to have an internet connection to download it and because I am using a 2020 MacBook Pro Touch Bar there is no Ethernet so there is no way to connect to the internet I don’t have a dongle ether an would like it if I didn’t have to go out and buy one just for this purpose