Brother printer won't connect to KVD21 Gateway

I went to my printers and used the LED screen to set up the WIFI on my Epson printers and that worked fine. I believe I had tried to allow my MacBook Pro find them and that was not working. The main issue I had was the older Epson workforce 845 was so old it had to have 2.4 GHz with WPA so I had to change the authentication on the 2.4GHz to allow WPA as well. It seems older printers may have some issues with the implementation of 802.11ax on the T-Mobile gateways. Maybe more so with the Arcadyan vs. the Nokia.