If you are getting power to the coach then I wouldn't worry about it unless you want to have the coach sitting at the dealer for three weeks waiting for the repair of a little blue light. It the coach is under warranty take the coach. back to the dealer and have them take a look. Maybe something small and a 5 minute fix, then again, maybe something that needs parts and requires a three week wait.
BTW, never had a light to tell me I was hooked to AC and never needed one. Microwave or AC units always answered that question. Now I can look at my inverter panel and if I am in by pass mode I have shore juice and if I'm in direct connect mode then I don't have shore juice.
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054