To make sure that only one channel can use a particular vanity, I tried entering a vanity name that is currently used, and did get a red tip that it was not available. However, I can create another channel using the same information I used on a previously created but NOT YET published channel that I created. So this is why I ask about the vanity code being "reserved" or something until published.
I'll have to test that out to see if there is a bug - I don't think you should be able to create a second channel using the same vanity code, published or not.
Is there any detailed information regarding vanity codes? I'd like to make sure the codes I entered, and the system let me proceed with, can be used. How do I confirm that? Is that something review process will decide?
As you have seen, if you enter a code and it is already in use, the system won't let you proceed. The only thing I would suggest is that you be certain you don't use or include any brand names or phrases that you do not have rights to use, and the includes the name Roku. Don't use it in your vanity code.
I haven't seen any issues to date where someone created a channel using a vanity code and was not able to submit it or publish it for any reason. The vanity code only comes into effect after the channel has been published, it won't work otherwise.
- Joel