Error 522 - Only from one ISP Provider

I have recently implemented Cloudflare to protect one of our websites. All my employees and clients can access the site without issue unless they use one particular ISP. When on that ISP they receive a Error 522. One particular Ray id I have from testing is 6bd28e963d962127 on 2022-02-10 04:23:03 UTC.

Of course multiple tickets to this non-working ISP’s NOC center and they state everything looks fine on their end and they can access the site. I was hoping that providing the Ray ID would help support point me in the right direction to get this resolved with the ISP.

Any help is appreciated.

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