A recent(ish) pull request from @jerrm for the Certificate Management module has been merged and published in certman ver 15.0.42, now in the edge repo. It removes the requirement that the cert validation request originate from the same IP to which the cert host name resolves.
We have done some basic testing, and things appear to be working as expected, but it is in need of some real testing in a multi-NIC environment where LE cert generation would otherwise fail.
fwconsole ma downloadinstall certman --tag 15.0.42
if necessary, you can downgrade again using
fwconsole ma downloadinstall certman --tag 15.0.41