Gregory,
Ok, so your config matches that of the technote I referenced and your understanding is correct. EVDG's have no awareness of / support for Domino clustering. Domino clustering will not harm the operation of two EVDGs, but it is not going to provide any failover / HA capability from the point of view of what the EVDG does - i.e. handle retrieval / delete / restore requests for Domino items.
So, in such a scenario, your EVDGs are effectively standalone and as per that technote, their existence on a MSCS clustered server has raised the potential for the EVDG registration process to fail, as the EVDG housekeeping task basically passes confusing server name information when the EVDG is situated on an MSCS server.
This is the bug that will be addressed in the forthcoming EV11, but there are manual workarounds to this you can use today. However, as these workarounds require registry or SQL stored proceedure changes, the technote requests that you open a case with Support so the options can be fully explained to you before committing any changes. As I said, post back here the case reference number and I will track it internally.
EVDG awareness / failover capability using Domino clustering is a long standing enhancement request for the product but not one that has as yet has made it to the Engineeirng hot/hitlist. The main reason for this is that a valid automated HA / failover configuration solution using MSCS or VCS exists, by clustering one EVDG server as an MSCS service / resource instance that can then failover between nodes, along with all of the other clustered components. As you already have MSCS in play, I do wonder if this is perhaps a preferable configuration for your customer, if they do have HA / automated failover requirements for the EVDG, as well as EV?
Regards
Paul
