Don't understand difference between the Channel Access Code and Vanity Code.
This information is found in your Developer Dashboard.
The Channel Access Code changes as you submit new channel packages. Each channel submission has its own Channel Access Code. This code installs a specific channel package.
The Vanity Access Code installs the most recently published version of your channel. If you have a new channel that is not yet published on the platform, you will not be able to install your channel using the Vanity Access Code. Once your channel launches on Roku, you'll be able to use and share the Vanity Access Code for you and other users to install and view your channel.