To access the Macmillan books, you have two URLs available:
From the Macmillan publisher's page
From the Mathew page
https://app.mathew.ai/auth/login (selecting the Macmillan Advantage option)
If you registered with your Gmail or another email, you can go to your Profile and click "Activate Advantage account" to sync the accounts:
With this activation, your account will become a Macmillan Advantage account and you'll be able to access the content of the assigned books.
Also, check that you have created the class for the module whose book you want to access.
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