The screen was clear enough. It had a field for username and a field for password, then the word "OR", then a field for the code. I did the right thing the fi

The screen was clear enough. It had a field for username and a field for password, then the word "OR", then a field for the code. I did the right thing the first time, except for mistyping the code. I agree that error-correcting the code is needless and probably even a bad idea. But a correct error message ("Your prepaid code is wrong") would have been easy and foolproof.