The website has disallow rules for Microsoft Bing Bot.
https://blogs.bing.com/webmaster/2012/05/03/to-crawl-or-not-to-crawl-that-is-bingbots-question/
Robots.txt
Get access to data on 17,828,004 websites Microsoft BingBot Disallow Customers. We know of 5,500,496 live websites using Microsoft BingBot Disallow and an additional 12,327,508 sites that used Microsoft BingBot Disallow historically and 2,986,939 websites in the United States.
Get a list of 17,828,004 websites using Microsoft BingBot Disallow which includes location information, hosting data, contact details, 5,500,496 currently live websites and an additional 651,485 domains that redirect to sites in this list. 12,327,508 sites that used this technology previouslyand 2,986,939 websites in the United States currently using Microsoft BingBot Disallow.
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