I am also getting an error
Interesting. Also Firefox? I tried Chrome and Edge, I don't have FF. It's OK on my machine (Windows 10). Your machines must not trust the Let's Encrypt cert it uses or something upstream in its chain. We had a problem at work with Let's Encrypt some time back, but I haven't heard of any new changes. Here's info on their latest outage, but that was so long ago it shouldn't be affecting you now. They have a list here of devices and versions that trust their certs. Again, this is old. We use Let's Encrypt so now I'm curious.
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