I had the same issue with my 2019 HC305.
The dish draws power from the Wally receiver and would not operate through the splitters that are factory installed. I was able to run a line directly from my bedroom unit to the dish and that solved the problem. However that means the bedroom unit must be on for the dish operate. I also had a badly crushed cable going to the splitters in the underbelly. I replaced the cable and it operates OK.
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