In the mod_md 2.4 (not in trunk) documentation
https://httpd.apache.org/docs/2.4/mod/mod_md.html
I see three times:
MDCertificateAgreement
https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf
This errors if not an existing account.
It should be now (should be nice we have it in 2.4.31) :
MDCertificateAgreement
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf
As long as the CA reports that the account has an agreement in mod_md,
no further checking is done. Existing accounts need no changes with
this new agreement.
I can see that the Wiki docu is newer:
https://github.com/icing/mod_md/wiki.
Cannot check if the rest of mod_md docu is up to date and in line with
trunk ?