This is the error message:
ERROR AutoSSL failed to request an SSL certificate for “subdomain.maindomain.com.au” because of an error: (XID 4pgkax) The response to the HTTP (Hypertext Transfer Protocol) “POST” request from “https://store.cpanel.net/json-api/ssl/certificate/free” indicated an error (526, Origin SSL Certificate Error): <html> <head><title>526 Origin …
ERROR AutoSSL failed to request an SSL certificate for “subdomain.maindomain.com.au” because of an error: (XID 4pgkax) The response to the HTTP (Hypertext Transfer Protocol) “POST” request from “https://store.cpanel.net/json-api/ssl/certificate/free” indicated an error (526, Origin SSL Certificate Error): <html> <head><title>526 Origin …