Hello @Ashleighmclaren
Thanks for the post.
Please be advised that channel logins or authentication are handled directly by the channel developer. We suggest reaching out to Disney Plus' customer support team to report the issue and get help. They can resolve the error you are having with channel authentication.
You can contact them here: helpdesk - Disney+
All the best,
Kariza
Kariza D.
Roku Forum Moderator