I cannot sign in to my iCloud to an Apple TV

Which model is this?

if you have an older model ATV, the code is entered onto the end of the password as one entry. Example: “password123456” then click submit 

• email- submit
• password123456- submit 

If you need more time you can have the code sent to you:

Get a verification code and sign in with two-factor authentication

https://support.apple.com/en-us/HT204974