@paradadf perfect, thanks! BTW, do you know anything about expected release for 4.1?

@paradadf Thank you, I suspected but the list of supported controllers I referenced isnt very clear on the need for a dongle. I'll look for the list of supported peripherals to see what dongles are supported...but does anyone have any suggestions on a specific dongle they've used with NES30 Pro or SFC30Pro? I have one of each and I will have to get dongles for both so I can do 2 player.
Thank you!

Fresh install of recalbox 4.0.0b on raspberry pi 3.
When trying to pair bluetooth controller (8bitdo NES30 Pro) it never can find any devices. Instantly fails.
I have tried latest NES30 Pro firmware 1.72 as well as older 1.69.
Same problem. Checked config file to make sure bluetooth controller support is enabled.

According to this it should work:
https://github.com/recalbox/recalbox-os/wiki/8bitdo-on-recalbox-(EN)

Looking for some help, thanks in advance.