@matthew-81 There's a page for CoreXY setup here: https://docs.duet3d.com/User_manual/Machine_configuration/Configuration_coreXY
If you have the correct codes in your config.g to turn on CoreXY mode, see the section on 'Testing motor movement' to get the motors working in the correct direction.
Also, post your config.g, response to M115 (for firmware version), and send M98 P"config.g" in the console and post the response to that (it will show any errors in config.g).
Ian
