I can only guess , not enough info , is that there was some trash / particles in the gas [ for the can , or anywhere ? ] and affecting the carb .
Removing the float bowl , making sure to collect any gas / etc. to look for particles , sometimes that all you may need to do .
Next , always use a filter when filling generator / this is common with chain-saws , typically they come with new .
Next , are you a chemist , quit mixing all these chemicals , when you do not know what the different types are going to react / or not , as an example - do not but any type of fuel stabilizer in fuel [ unless you know that the fuel in an engines tank is going to sit for long periods - like close to 1 yr. ] then use what is recommended - oz. per gal. ?
I know for a fact that depending on what fuel lines are in a product , Sea Foam can desolve some types of fuel lines .
So basically you really almost never need any kind of fuel additive , I've been in the auto repair bis. for over 40 yrs. --- more problems from additives //// then not using any !!!
If any motor driven item is going to sit for long at least 6 +++ months , just run tank empty .
Last is , it is near new , it may have a fault - take back to where you bought for service / warrantee .