Printer problems

Guys, my PC (win 11-25H2, Brother DCP-L2540DW) has stopped printing. PC is connected via Ethernet (router), my wife's Laptop is connected via Wi_Fi, does not print either.
Her desktop is connected via USB, prints fine.
The printer Wi-Fi is set up, SSID, router key, green Wi-Fi light is on.
I have tried all kinds of things but no dice.
The PC lists the printer as default, new driver installed, does not print test page. The print queue shows entries, but with an error message.
Can someone please help?

This answer is under the assumption that on the 2 devices that will not print, your printer is set up as direct wireless and NOT
as a shared printer by name.( ie by the computer name/printer name of the device connected to the printer with usb)

Since the PC connected to the printer can print but network computers can't print, it indicates a wireless networking problem in the printer, most likely its ip address has changed and the computers are looking for its old ip address. I always assign a static ip address to the wifi side of my wireless printers to prevent this from happening. Here are some things to try. Check to see if you can print after each one.

On the computers that will not print, run the troubleshooter. Setting>system>troubleshoot>other troubleshooters>Printer>Run

On the computers that will not print wirelessly, restart Print Spooler Search for Services, select Services System from search results, select run as administrator. Find "Print Spooler" in the list of services and restart the service.

Try Power Cycle Everything : Turn off the printer, all computers, and router. Wait 30 seconds. Turn the router back on and wait for internet connectivity, then turn on the printer and computers. That may well straighten it out.

Ensure your computer is connected to the exact same Wi-Fi network as the printer. Most have 2.4GHz and 5GHz bands; ensure both devices are on the same band.

If any computer still will not print wirelessly, uninstall the printer on that computer, restart, then reinstall printer.