CBS All Access error: "50003 Fairplay CKC URI scheme does not match designated scheme" on Apple TV 4K

It would be an issue on their end that is causing the error. You can try force quitting the app along with reinstalling. However, if it persists then you would need to reach out to the developer.

Did it fix itself? Or what did you do?

Seeing as it’s been over 2 weeks since the OP posted you may not receive a response.

However, it’s not an issue a user can fix. If it persists then it means it requires an update or further investigation from CBS