How to change Certificate Authority?

I have a domain that needs to be bound to Google related services, but I have tried many times without success, and this problem has never happened before.
Finally I found out that my Certificate Authority is Let’s Encrypt, this should be the problem, is there any way to change the Certificate Authority to Cloudflare?
The domain is gaycao.com.

Cloudflare is not a certificate authority. There should be no issues with either CA that Cloudflare use but you can select between Digicert and Let’s Encrypt using Advanced Certificate Manager.

https://developers.cloudflare.com/ssl/edge-certificates/advanced-certificate-manager/

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