Thanks for reaching out here in the Community!
We would recommend performing a factory reset on your Roku TV and then try linking your existing Roku account once again.
Perform the following steps with your Roku remote or the Roku mobile app.
- Press Home on your Roku remote
- Scroll and select Settings
- Select System
- Select Advanced system settings
- Select Factory reset
- If you have a Roku TV, select Factory reset everything. Otherwise, move to the next step.
- Follow the on-screen instructions
For more information, check out this link: How to system restart or factory reset your Roku streaming device
Let us know how it goes!
All the best,
Roku Forum Moderator