Wifi not working

I flashed a fresh install RPI OS bookworm 64 bit lite onto a SD card for a 3B+ and the wifi doesn't work. Pretty certain my SSID and password are correct. The pi is in a cluster case with another pi (running 64 bit desktop) which is connected via wifi working fine. Ethernet works but would rather use WiFi for now. Board: 3B+ OS: RPI OS lite Bookworm 64-bit headless

Do you have a display and hdmi?

Yeah

Headless so cli only but cli is best so

I agree but you can use cli on a display

Ik

Please be aware that Pi3+ have had problems if the SSID is the same for 2.4GHz and 5GHz, I haven't seen that it is corrected or if it persists.

interesting, the SSID is the same

is there a way to get around it?

or just ethernet

Fixed using raspi-config

And setting up wireless that way