I believe the problem is truly that you do not have a 4k client or a 4k RVU active on your account. Your RVU is working because it took over the spot of an existing client (I'm guessing lower than a C61k).
If you give them the MAC address to authorize the 4K RVU set properly in their system, and have an HR54, it should automatically (or at least give them the option) to add 4k service to the account.
Right now, with only a HR54 and clients (less than C61k) on the account, they likely don't even have an option to add it because their system doesn't think you have 4k hardware.
My take is that you do need them to authorize the 4k RVU set, even though it is working in place of a client right now, to be able to add (or have added) 4k service.
In the event a tech was installing this, it would not pass their install test if it was hooked up via ethernet. As you already have the RVU installed and working, as long as you don't have any truck rolls, you should be good to go. Bear in mind that it is working fine with SD/HD service, but you haven't been able to test it with 4k. If there is nothing major going on between the TV and Genie, and it is a good router/switch setup, it may likely be fine. The unknown of home networking equipment that is beyond the scope of DirecTV's control is why it is considered an unsupported setup using ethernet. It will work, but it will not pass the installers test, as it is not how DirecTV pays their techs to install it.
Good luck, I believe your best step is to get the 4K RVU client added to DirecTV system using the TV's MAC address.
If you give them the MAC address to authorize the 4K RVU set properly in their system, and have an HR54, it should automatically (or at least give them the option) to add 4k service to the account.
Right now, with only a HR54 and clients (less than C61k) on the account, they likely don't even have an option to add it because their system doesn't think you have 4k hardware.
My take is that you do need them to authorize the 4k RVU set, even though it is working in place of a client right now, to be able to add (or have added) 4k service.
In the event a tech was installing this, it would not pass their install test if it was hooked up via ethernet. As you already have the RVU installed and working, as long as you don't have any truck rolls, you should be good to go. Bear in mind that it is working fine with SD/HD service, but you haven't been able to test it with 4k. If there is nothing major going on between the TV and Genie, and it is a good router/switch setup, it may likely be fine. The unknown of home networking equipment that is beyond the scope of DirecTV's control is why it is considered an unsupported setup using ethernet. It will work, but it will not pass the installers test, as it is not how DirecTV pays their techs to install it.
Good luck, I believe your best step is to get the 4K RVU client added to DirecTV system using the TV's MAC address.