No power from shore or generator, ok on inverter, need help

First since you don't seem to be aware of it there was a recall issued for the IOTA ITS-50R transfer switch. Of course since the old Monaco is no more it does not mean much.

Find your transfer switch and with the power disconnected open the cover and look for burned/melted wires. If everything looks clean, tighten all connections and try your power again.

Recommendations are to replace the IOTA ITS-50R. I say this but, I am still running on mine. I do check it at least once a year though.