I had the same issue when I tried them. Use the file explorer somewhere in the dashboard to access the server file system. Inside there is a README. It explains how to set up your own domain. It's definitely an elest.io issue and not Lemmy.
this post was submitted on 06 Jul 2023
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I'm absolutely not familiar with elest.io but from what you're saying I would check that you have a certificate for that domain / https. I don't think it's PTR records at all.