We do apologize for the inconvenience this has caused you.
Try performing a factory reset on the affected device then try linking your existing Roku account once again.
Performing a factory reset using the hardware reset button
- On the back or bottom of each Roku device is a reset button. On some devices, there is a tactile button, while other devices have a pinhole button.
- If your device has a pinhole button, you will need a paperclip to perform the factory reset.
- Once the reset button is located and your Roku device is powered on, press and hold the reset button firmly for about 10 seconds. The indicator light or status LED will blink rapidly on most Roku devices when the factory reset is complete.
For more information, check out this Support article: How do I factory reset my Roku® streaming device?
If still no dice, reply here with the serial number of the Roku Express. It can be found at the back or underneath the player itself.
We look forward to your response.
All the best,
Roku Forum Moderator