If I add the domain for xmpp and all the servers in CSR I can use that certs for the edge and core in a production environment? Y---Yes you can use but it will be better if you use separate for edge and one single cert for all core including all servers name in SAN list.
For relationship between different component it will be good if you go through the certificate guide which i provided earlier.
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Please rate if it is helpful and mark as accepted solution if applicable....