Certificates for that domain have been issued as recently as Thursday:
Regardless, similar issues have come up in the past:
In those two cases, the websites in question had been listed as unsafe by Google Safe Browsing, but the listing was later removed.
I can't speak for the past, but Google currently considers your site safe:
https://www.google.com/transparencyreport/safebrowsing/diagnostic/#url=www.auxpetitsbizcuits.com
And Let's Encrypt seems to be willing to try to issue certificates for it.
I'd suggest that you try to issue a certificate again. If it works, perfect! If it fails, you can contact OVH and make sure they actually try again, or provide you with more information about the error.