Why can't I delete courses on SMM?

Tried to delete a course I accidentally uploaded twice (don’t ask how) and I just got hit with error 106-0103. There’s no information about what happened in the error message, nor is there any info available on the Nintendo Support page, so what’s going on here?

Also, Is there any way to request for a course to be deleted? If so please tell me and I will give the course ID’s.