Strange trouble with AirPlay from my iTunes in my MacBook Pro

[ToM7]

1. Ok so listen, I'm trying to play the music that I'm listening in my iTunes library on my TV 4K, and then the iTunes showing me that the on the TV 4K I've a lock, so after i'm entering the password that shown on my screen on my TV that I get for the airplay, it's wrote me that the password was incorrect (strange!), after it it showing me this message (screen shot)
2. Anyone know how to solve this?

 

[techwarrior]

I have had mixed results with passwords and codes on Airplay, I rolled back to anyone on the network. For home users, this is probably secure enough unless you share your network with neighbors or unsavory characters.

Or you might try rebooting. I know that sounds awfully tier 1, but it often fixes things that get out of sync.