Intune Device Lock Policy
The "Password" section of the Device Configuration Policy 'Windows 10 Device Policy' If the'password' is set to 'not configured' and 'Maximum minutes of inactivity until screen locks' set then the policy still applies.
In order to fix this I had to toggle Required for the Password Field then I could access the Field "Maximum minutes of inactivity" and set it to Not configured.
This seems like a bug. If the Policy is set to Not configured then it shouldn't configure anything but it was clearly configuring the maximum inactivity timeout still.