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@Lexi Conn wrote:

Hi, the botom right corner- last on the list.

https://www.irs.gov/pub/irs-soi/18pf_business_codes.pdf

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Sorry, I missed that this was a 990.  That link is for the 2018 Instructions, but that code is still on the 2022 Instructions as well, so I'm not sure why it isn't accepting that.

Most of the complaints I've seen this year about code problems (including the original poster in this thread) is because the code they were using is no longer valid in the current Instructions, but that doesn't seem to apply to you.