as Noah said, you gotta pull your skills to your skillbar, this is a bug
open your skilltree and drag and drop the skills to your bar
also make sure to pull them to the correct form (if you are in human form, pull them to skillbar; then change from to doggo, succubus or bulldemon and pull these to it again)
had this aswell, result was i had skills and could not use them
tooltip then hints for which form your skill is
it is a bit difficult to explain, if you still dont get it let us know and i can make a picture by picture explaination