Website Deindexed as I Added on Cloudflare

On 5th Jan 2022, I have added one domain to Cloudflare and did not make any changes to Firewall. On the next day, the website got deindexed from the Bing search results. The same thing happened to one of my other websites back in October 2020.

Can anyone help me out to understand the problem and fix the issue?

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