Flexible SSL Cert Issuer Changed - Broke Client's Connection

I use Cloudflare’s Flexible SSL with Universal SSL on my website + API. I recently had a client contact us saying that we changed our Certificate Issuer and it broke their connection because they use a list of “trusted certificates.”

I don’t really know what this means or why they do this. But, they asked that we notify them when our Certificate Issuer changes in the future.

I looked into it and it seems Cloudflare did change our certificate issuer recently to Let’s Encrypt. I see here that Cloudflare may change the issuer: Certificate authorities · Cloudflare SSL/TLS docs

I have a few questions:

  1. How often does Cloudflare change the issuer?
  2. Is there a way to prevent the issuer from changing?
  3. Does using “Advanced Certificate Manager” let you prevent the issuer from changing?

This page says “Advanced Certificates” let you “choose the Certificate Authority to issue the certificate.” Advanced certificates · Cloudflare SSL/TLS docs

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