Note that each edition of Windows uses its own unique product key. For example, if you have a license for the Windows 11/10 Home edition, you cannot use it to activate Windows Pro or other editions.
Not sure what your key is? Run a program like Magical Jelly ... you’ll find the listings for Windows 11 or 10 Home (or Windows 11 or 10 Pro), pick a seller from the list, then add their product ...
The Copilot button should now disappear from your taskbar ... it from their computers a bit more permanently. Those on Windows 11 Home have to fall back on a registry tweak.
Windows 11 may soon have a new home for the widget button for those with the taskbar aligned to the left. Windows 11 build 22635.3420, which was released in the Beta Channel on March 29 ...