its the country that the school is authorized through that you need to speak to.
Most in the US are through the UK.
The UK doesn't have a problem if you were taught by a JAR or EASA licensed FI through a school. In fact you used to be able to count up to 10 hours from any ICAO state but i don't know how that stands these days.
You need to do a search for CAP 804 if its a UK oversight school.