Having said that, too many errors in Sitemaps will also work against your site so be careful. Ideally less than 1% error rate.
Below is the quote about the 1% error rate on this article. (note: the other search engine is Google)
Out of the two search engines, Bing particularly has a low threshold, or at least they outwardly state they begin devaluing sitemaps if 1 percent of the URLs result in an error (return anything but a status code 200).
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