Welcome to the Roku Community, @Hateapps!
Thanks for reaching out. We'd be happy to provide further information regarding this matter.
Please note that Roku doesn't manage channel logins or authentication, and many Roku channels are developed and maintained by the channel providers themselves. We highly recommend coordinating this with the service provider for further assistance.
You may reach them here: STARZ Support
We hope you find this information helpful.
Warm regards,
Carly
Carly Y.
Roku Community Moderator