Thank you for your post!
Your instructor has most likely created a new class section for the current semester, and the old class section is possibly marked as finished. You'll want to consult with your instructor to verify that you're registered for the right class section. Mainly, request that they provide the Student Flyer or the 6-digit WileyPLUS Course ID. Then, log into the new class section with your existing account. If you receive an error saying you're already registered, then the previous section was not marked finished by the instructor. At that point, let us know and we can manually move you to the new section.
I hope that helps! Please let me know if you have any questions. Have a nice evening!