What is continuing to append ".local" to the HA hostname?

[NathanCu (Nathan Curtis)]

Just access it at ha.domain.lan

Any additional naming is additive - it doesn’t replace anything… Then the cert won’t blow up.

Instructions for setting up HA to respond to a specific url with SSL is here :

Certificate Authority and self-signed certificate for SSL/TLS

This guide has been migrated from our website and might be outdated. Feel free to edit this guide to update it, and to remove this message after that. If your Home Assistant instance is only accessible from your local network, you can still protect the communication between your browsers and the frontend with SSL/TLS. Let’s Encrypt will only work if you have a DNS entry and remote access is allowed. The solution is to use a self-signed certificate. Please note, however, that after y…

Set that up with whatever urls you want SSL on and your cert has to be resolvable in DNS and match either the subject or one of the SANs in the cert. No exceptions. But if you only want one url the only put one. But you MUST then use one of the SSL urls to access ha from that point forward and your CRL must be resolvable.