Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Re: Signed up for Peacock Premium on Roku - but how to login to Peacock elsewhere?
If you sign up for an account through Roku, it usually can only be used on Roku devices. This is yet another reason why you should NOT use Roku for subscriptions but instead sign up directly from the service. Cancel the Roku-based account, and create a new direct account. You may end up wasting a months subscription, but consider it a lesson learned.