Help getting started with Roku devices, including setup, connecting your device to your TV, linking a Roku device to your account at my.roku.com/link, adding channels, subscribing to services, and more.
Did you get the subscription through Roku, or direct from Discovery+. I STRONGLY recommend subscribing directly from streaming sites if possible. You then typically supply your email address and password used to create the streaming service account. In some cases, you will need to use a web browser to log in to the service and enter one of those letter/number codes to authorize a device.