New Vanguard One-Step Update Error

Question

In the past week or so, when doing one-step update, my wife's Vanguard accounts have been returning an error OL-304-A, saying it doesn't recognize the account. It's the same account as always, my wife didn't change anything. It says "Additional information from Vanguard: " and there's nothing following that. My Vanguard accounts are fine. Can anyone say what's the problem? No passwords, etc were changed either.

Diver42420 · Answer

Solved, it was an old account that I 'hid' but failed to turn off automatic update for. Deactivated and now error is gone.