thee is no place to enter the 6 digit two factor verification number

See the following from Two-factor authentication for Apple ID - Apple Support

If you use two-factor authentication with devices running older OS versions—like an Apple TV (2nd or 3rd generation)—you might be asked to add your six-digit verification code to the end of your password when signing in. Get your verification code from a trusted device running iOS 9 and later or OS X El Capitan and later, or have it sent to your trusted phone number. Then type your password followed by the six-digit verification code directly into the password field.

No spaces, like passwordxxxxxx.

Possibly you exceeded the time limit. See discussions.apple.com/thread/251787405 for a workaround.

Can't make this work ... any chance the format of the password (ie. characters such as "!") messes with acceptance of the code?

Or, is there a space between the password and code (ie. password xxxxxx or, passwordxxxxxx)?