If you can call the field office running the course I would. My buddy had a similar issue with the firearm registration and he called and got a spot. He initially registered and had to no show for some family issues and they wouldn't let him re register because his account got flagged. He was told that people from some anti hunting organizations had been registering for the classes and then no showing to keep people who need the class from getting in. But after talking to someone he was able to get into the next one. I got my firearm cert during early covid and it was pretty easy to get into for me so I can't share the same sentiment.