Hi,
A Brother MFC-L2750DW is listed as supported in About AirPrint - Apple Support. An AirPrint-enabled printer is compatible with macOS, and can be used without additional drivers, provided that the printer and the Mac are connected to the same network (Wi-Fi router).
Brother recommends using AirPrint with this printer (and a normal printer driver for macOS 12 is not available for download).
You may have to reset the printing system and re-add the printer to use AirPrint. See the following articles for details:
Reset the printing system on your Mac to solve a problem – Apple Support (UK)
Add a printer to your printer list so you can use it on Mac – Apple Support (UK)
AirPrint works with wireless (Wi-Fi) or wired (Ethernet) network connections. Since the MFC-L2750DW has an Ethernet port (in addition to Wi-Fi), you could choose to wire the printer to one of the LAN ports of the Wi-Fi router instead of using a wireless connection.
Do not use a direct wireless connection (Wi-Fi Direct) between the printer and the Mac. Always connect via a Wi-Fi router (infrastructure mode).
If there is a problem with AirPrint device discovery, you could try the following procedure (in this order, with these waiting times): Power off the Wi-Fi router, the printer, the Mac, and all other connected devices/computers. Wait two to three minutes. Power on the router. Wait two to three minutes. Power on the printer. Wait a minute or two. Power on the Mac. Finally, power on all other devices/computers.