Then I proceeded to verify the propagation of the record on mxtoolbox.com and yet Certbot returns the same error as the one posted by OP.
I'm banging my head on the wall for this issue for a while and I really don't know how to fix this.
Thank you so much, certbot succesfully completed the procedure but unofrtunately it turns out that the wildacard subdomains are still not certified, while the main website (sitepard.com) it is, but that was certified previously.