Hi @Lyn6,
Welcome to the Roku Community!
We are here to assist you with your concern about adding a new Roku camera to your Roku Smart Home app.
If your Roku camera is no longer functioning, the best solution is to remove it from your Roku account and replace it with a new one. To do this, first, unlink the old camera from your Roku account in the settings menu. How to unlink a Roku Smart Home device from your Roku account | Roku Official Support.
After that, you can set up the new camera to add a working device to your system.
For more details please visit our Roku Smart Home Support articles.
We hope you find this information helpful.
Regards,
Riamie
Riamie D.
Roku Community Moderator