Check these steps to find the problem and fix it:

1. Make sure you joined the correct class

Ask your teacher for the class key and follow the steps here: How do I join a class?

2. Make sure you activated the correct code

The code must match the materials your teacher is using. 

3. If you still see 'Activate' next to the assignment, ask your teacher for help

The teacher may have used different materials when creating the assignment.

4. Check if your code has expired.

If it has expired, you need a new one. You can buy a new code from our shop for some Cambridge One digital materials. If you cannot find the right material, please ask your teacher for help.
Important: If you are redirected to your home page even with a valid code, read: Why am I sent back to the dashboard when I try to open my assignment?