if not the adapter, it 'COULD' be your ATS(auto transfer switch), meaning that the power from the shore is coming into it, but not being sent FROM it to your Breaker panel. If your generator provides the power to run everything, then it's certainly a Shore Power issue, either the Adapter or the ATS.
Generally, the ADAPTER provides the ability to have the RV 'share' the 30amp power along both 'sides' of the 50amp double-pole breaker in your RV's Breaker panel, but it also have to go thru both 'sides' of your ATS, first, as well.
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