Trying to do my Annual return, and I've found two letters from previous years with the same authentication code, but it doesn't work. I've pressed the "I've forgotten my code" button (which I haven't), but that means waiting a week for a letter.
Does anybody know if they've recently changed the codes for some reason? Or perhaps the system just doesn't work on a Sunday.
Does anybody know if they've recently changed the codes for some reason? Or perhaps the system just doesn't work on a Sunday.

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