The issues have been outlined in dozens of posts
The CBS app does not perform property
1) It continually provides error codes when trying to access channels
2) It requires continuous 2 step login and log out processes to get it to operate.
EXAMPLE... every time you want t o use the app you have to have a laptop handy, go online and enter a code and then it goes back to the roku app to open.
Every other app works on Roku (for the most part) but CBS has this problem with remembering that you have logged in or that you have an account.
Most people have given up on using it
If you would like to help. 1) remove the CBS app from ROKU until they fix it.