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Honestly I’d stop focusing on “guidelines” at this point and go straight into log analysis.
If Bing suddenly deindexed a previously healthy site without a manual penalty, something likely changed in crawl behavior or trust signals. A lot of people miss CDN/WAF configs accidentally challenging Bingbot.
Also if this is a tracking tool, Bing may be classifying parts of the site as thin/utility/generated pages depending on how the URLs work. Especially if there are tons of similar pages with low unique value.
