CloudFlare IP trying to reach /.well-known/pki-validation/ca3-[long code redacted].txt

Wordpress website running a LetsEncrypt cert. In the backend I can see repeated attempts from this Cloudflare IP: 2606:4700:1101:0:a901:e7bc:9061:8446

Trying to reach this file (which doesn’t exist): http://mydomain.com/.well-known/pki-validation/ca3-[string of numbers & letters].txt

That file looks like it should be some sort of SSL or txt DCV validation file. When using Cloudflare with Dreamhost and LetsEncrypt is there some txt file I’m supposed to upload through SFTP? Or is there some other configuration error?

Forgot to mention, in Cloudflare SSL/TLS encryption mode is Full (strict)

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