Paramount plus on sky q mini

[Charlie+Sky]

We have activated Paramount plus on Sky Q and it works fine, but....

...we can't sign in to Paramount plus on a Sky Q mini box.

If we open the app it asks you to sign up or sign in.

Sign in gives a QR code which takes you to the app on the phone. If you log in there, it does not offer anywhere to input the five-digit code from the TV screen.

What do we do next?