Answer:

1. Access codes have six parts separated with a dash and look similar to this:
   LSWMWL-HELLO-LEARN-SIDED-TOPAZ-VEXES
2. Each access code can be used only once. The access code is needed to register or add a new product.
3. Make sure that you have not used the code already.
4. If you have bought a second-hand book, you might need to purchase a new access code.
5. If you continue to have issues, please contact Technical Product Support.