Sounds like you are not getting shore power.. Microwave may be fed by an inverter (likewise TV's) but all the things that are NOT working eat 120 shore power or generator only
Suspect list in linier order
Park breaker/outlet/power
Shore cord plug, and if disconnectable the outlet
RV inlet (If shore cord disconnectable)
Automatic transfer switch (If you have a ganerator and an ATS)
main breaker inside RV
And the Energy Manager as well. Also a Surge Guard or like device (Some are called surge guards some other names (EMS) but the management system is also called EMS kind of confusing)