My IT people were able to identify the culprit and resolve all System Coupling issues caused by the 2023 Ansys releases by simply deactivating the IPv6 protocol in the ethernet properties. Turning off IPv6 is the only way to have System Coupling connect all participants in 2023R1 and 2023R2, when the workstation belongs to a domain. It is unfortunate that Ansys was not able to help on such a widespread bug.
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