I can not log into YouTube with the app for my new account. I can log into an older account. I keep getting a message that it is not available. I tried two step verification and app specific codes but no luck. Any ideas? Thanks ken

Have you confirmed your new accounts email?

I am happy to say I have found a solution to my problem. I fixed it by going to the my channel page. Then I clicked on settings. Then I clicked info and settings. Then I clicked edit channel URL. I entered a new custom URL. I chose a name as close to the user name as I could get. This caused the URL to change from /channel/ifneofjie3383eid etc. to /user/"name". I wonder if the app is coded to always look for a path starting with /user rather than /channel. I do not need to use two step verification or app specific passwords. Problem solved!

I also want to add that I was having the same problem with my blu ray player YouTube login and my video capture YouTube uploaded software login. All three were fixed by changing the channel URL.