No. Both MacOS and iOS happily resolve and connect to the machines in my homelab.jhw domain. I did add the root cert of my CA (Certificate Authority) to the trust store on MacOS and iOS, so I can also enjoy TLS connections. Scroll to the "Add the certificate" part of https://jan.wildeboer.net/2025/08/Create-SMIME-Cert-stepca/ for the HOWTO that worked for me.