Hardware 8bitdo M30 controller not working

[DaFixer]

Hi, last time I want to play Street of rage 4 with my 8bitdo m30 BT controller on the switch (CFW).
But for some reason I can't connect it, It was working fine when I was playing Sonic Mania some time ago.
I update the firmware of the controller and still no luck.
My 8bitdo SF30 pro and 8bitdo lite works great on the some switch...

 

[somebeans]

Can't link the FAQ but:

My M30 Bluetooth controller does not connect to Switch no matter how many times I have tried. What should I do?

• This might be caused by there are too many controllers connected to your Switch, as one Switch can take up to 10 controllers at a time maximum. Please follow the steps below to fix it:
• A. Go to ‘System Setting’ on your Switch, then click on ‘Controllers and Sensors’ to disconnect the controllers which are connected to it
• B. Restart your Switch
• C. Press and hold Y+START to turn back on the controller. Press the pairing button on the top of the controller for 3 seconds
• D. Go back to ‘System Settings’ and choose ‘Change Grip/Order’ to pair them

Or try connecting via USB cable for pairing, a feature added in M30 firmware v14 "Added bluetooth pairing function via USB cable on Switch mode."