With https://github.com/dogtagpki/pki/pull/4903 merged, Dogtag PKI will allow specifying CA authority ID or DN to configure ACME issuer.
Add support for that in IPA. In order to configure ID of the CA to issue ACME certificates one can use pki-server acme-issuer-mod --type pki "-Dauthority-id=${caid}" where caid is the CA ID obtained with ipa ca-show <CA name>.
pki-server acme-issuer-mod --type pki "-Dauthority-id=${caid}"
caid
ipa ca-show <CA name>
Also, ACME clients like certbot have switched to use ECC algorithm by default. Probably makes sense to investigate if ACME profile can be switched to use ECC as well by default.