I did some further checking. I have 2 other websites (launched in 2024) using a different hosting company with Cloudflare for each. So far I have not been getting any Cloudflare emails with Error 521 for those websites. So there might be something else going on in Cloudflare regarding my 3 sites (launched many years ago with Cloudflare) where I getting Error 521. Just have to wait for support to direct me.
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