Originally Posted by lcv800
Could also be that inverter may only power a specific outlet or maybe fridge Inverters, ...
The OP said the outlet was labeled as inverter powered.
Most likely, inverter is "off". Check inverter's Owner's manual for switches, circuit breaker resetting, and fuses. There is probably a "troubleshooting" section in the manual.
Manual can probably be found on-line if you don't have one.
I wish you good luck and happy trails ahead!