Why won't my Apple Pencil pair to my iPad Mini 6?

The Apple Pencil (USB-C) should be compatible with your iPad mini 6.

Just to make sure you didn't miss a step, see if the following Apple Support article can help:

• If you can't pair Apple Pencil with your iPad - Apple Support

Here's another article that may help: Apple Pencil not working? Here's our troubleshooting guide - Apple ToolBox

Then may I suggest that your next step would be to contact Apple Support directly for further assistance with this matter. To do so, simply select the "Support" link on the lower left-hand side of this forum's web page.