Readtopia is prompting students for Activation code.
Readtopia is a tool for Admins/Educators that have a Readtopia subscription.
If a student that uses a username/password for log in goes to the Readtopia home page it will recognizes they have a Universal account for a Don Johston product and ask for an activation code.
Currently there are no online student Readtopia accounts. The student can just close the browser tab and continue using the Don Johnston Universal tool(s) they have a subscription for.