How do you enter a verification code when there is no box?

On this model, the two-factor verification code should be entered, together with the password, in the password field. Like so: password123456.

You may experience that the code is getting invalidated by the time it takes to enter both the password and the verification code.

Instead, do this: First enter the characters of your password (do not submit yet), then manually request a new verification code (ignoring earlier codes), then append that code to the password within 30 seconds, then submit.