Anonymous participant Cancelation is different than rejection. It means you entered some sort of datapoint incorrectly. Still lose the application fee though.
You are supposed to apply via the embassy in the jurisdiction where you are physically located. So if you are physically in Vietnam, you apply via one of the two embassies/consulates in Vietnam. You should only apply via your home country if you are actually in your home country.
Also, the 5th was a holiday, so only been 7 days. LA states 15, and if they ask for additional documents, they add 5 more days once those documents are submitted