Misty step amulet?

I have misty step amulet but cannot get it to function on any characters. Im new to the genre and realize that there are a lot of things to keep in mind but based off of the item description It should just be an equipped item and it's good. For some reason any of my characters that have it don't have the option for that spell.

If someone knows how this works or why I might be having issues please let me know before I go dark urge on my save file

Many thanks