I've met a question asking to debug an Excel formula without providing the necessary details: https://superuser.com/questions/1029939/excel-index-match-returning-value-that-doesnt-exist-in-the-table
According to my limited experience on Stack Overflow, these questions are closed, and I agree with it. However here we don't have reference to these type of questions in help.
How should I manage these questions? Close as off topic / too broad?
The question mentioned in the comment (Are diagnostics/troubleshooting issues on-topic and not too localized?) is about diagnostics, which is similar, but not the same as debugging.
From the Stack Overflow help center:
Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers.
Based on that, I'm quite sure that my example is not a useful question. I'd just like to get confirmation, and I'm not sure what the reason of closure should be.