I’ve never had this issue but I run basically everything through docker and presumably it bundles this by default.

I would recommend just using caddy. It removes the complicated part of ssl management. For a local network it’ll setup a local self signed certificate authority and you can just install those certificates to any devices on your LAN that you want to have access. For a public setup it’ll use letsencrypt. You will still need to setup dns if you want wildcard routing.