I wanted to report the same issue today. It’s quite confusing that a category is pre-selected that the user is prohibited from posting in. The error message does not give you any hind why there is an error. So you need to have to knowledge of the categories and their permissions to know why posting the topic failed.
It would be more user-friendly if the error message could prompt you to select a different category or if the category would not be pre-filled when the user is not allowed to post there.
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