Hi @amostran,
Welcome, and thanks for posting here in the Roku Community!
Please note that when trying to add a subscription, please make sure you are accessing the Roku website and logging into your Roku account. Please be aware that you will be unable to add a Roku Smart Home subscription through the Roku Smart Home mobile app.
For more information about how to set up a Roku Smart Home subscription, visit our Support page here: Sign up for a Roku Smart Home Subscription.
Please keep us updated, and we will be able to assist you further.
All the best,
Chel
Jecheal R.
Roku Community Moderator