PFSense Firewall 522 Error when using Let's Encrypt Cert

I set up my pfsense firewall using the ACME package to integrate Let’s Encrypt certificates for the localhost on the firewall. When I set it up it worked perfectly for that day. Then the next day I tried to access my firewall with the new domain name and it no longer works and returns a 522 error. I haven’t changed anything and I can’t work out why it stopped working. Not really sure what to do next?

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