Certificate Pending Validation for Lets Encrypt

Hi there
I ask my question in french but maybe someone have an answer for me.
I use Lets Encrypt for the SSL certificate.
In Cloudflare I have this message : Certificate Pending Validation.
I was install the plugin “Flexible Cloudflare SSL” on my wordpress.
Can you tell me if I must wait 24 hours or I have a problem please ?

A post was merged into an existing topic: Certificate Pending Validation