When you lock all Taskbar settings in Windows 11/10 you will not be able to make any changes to the Taskbar. Check the DWORD value mentioned. If it is mentioned as 1, it would have the effect ...

If the default Windows mode is on Light, you can’t choose a custom color. This article explains how to change the color of the taskbar in Windows 10. How to Change the Taskbar Color in Windows 10 ...