Beamer keeps asking PIN code connecting to Apple TV
Same thing happened to me. Definitely an issue with the new tvOS. Beamer just has to update their app so it's compatible. I've already shot an email to their support team to let them know. Right now the only workaround I've found is to set the Apple TV to require a password (not a 4 digit PIN) - it should say what it is directly below that (like a 6 digit number) and then when Beamer asks for the password - just enter that and it'll accept it.