Looks like Cloudflare doesn't like the TXT entry without quotes which makes sense. This is the error listed for the TXT entry created by Cert Warden.
The content field of TXT records must be in quotation marks. Cloudflare may add quotation marks on your behalf, which will not affect how the record works.
It looks like it delays the record from being propagated so if you could include quotation marks that would be great! I did get it to work by setting pre-check wait 5 minutes but would prefer the entry be created including the quotation marks so 2-3 minutes would always work.
Thanks!!! So far really digging this!
Looks like around the end of the year, Let's Encrypt will be allowing IP Address san elements but requiring http-01 and tls-alpn-01 for validation, do you plan on implementing IP Address san elements?
Regards,
durken