Good to hear the company is trying to help out with a new component, it's not the first time an electrical part is not quite right.
You say it sat for 8 months, you did get all that gas out of the system first before trying to start? Old gas can easily gum up your system and cause it not to start.
Did it run "after" the carb was rebuilt? If not, I would suspect the carb has something wrong with it still..... Does your spark plug get wet with fuel ? I'm just wondering if the fuel is making it to the piston..... Fuel may be in the carb but it has to be able to be drawn to the combustion chamber to ignite. That's why if you pour just a little bit of fuel down the hole where the plug goes , if it tries to run , then the fuel isn't getting there on it's own for some reason. (plugged jet , etc)
I'm interested to hear what fixes your issue. Normally a blue white spark has lots of capacity to ignite fuel. It may not have as much "power" if the spark is a little less than it should be , but definitely should run. When your spark is an orange color , then that's weak spark for sure and won't ignite the fuel.
I'm leaning towards a fuel issue.... Good luck.