I had a similar issue yesterday. I had no power to the plugs and my inverter control panel showed an error code. Luckily all I had to do was reset my Xantrax inverter. What I didn't realize was if the inverter fails for some reason, the AC doesn't default to passing power through the inverter
So basically if my inverter fails like it did and won't reset, I can't get power to the vans breaker panel via the shore power plug. Not a huge deal breaker but if I did need AC power in that situation, I'd need to abandon the shore power plug and use an extension cord that would plug into shore power or a generator to power items inside the van.