I have a foreign-based PPL issued by the FAA. According to the regulation of my original (non-FAA) PPL, I am required to accomplish a biennial flight review with an authorized instructor in my country. I had a flight review less than a month ago to meet this requirement.
During a checkout flight in the US, the local CFI stated that the flight review must be conducted by an FAA-authorized CFI - therefore the flight review I had in my home country (less than a month ago) is not sufficient. He stated that FAR §61.56 requires I have "Accomplished a flight review given in an aircraft for which that pilot is rated by an authorized instructor", while FAR §61.1 defines an "authorized instructor" as "(ii) A person who holds a flight instructor certificate issued under part 61 of this chapter and is in compliance with §61.197"
The CFI that approved my last flight review is authorized by the local authorities in my country, but not by the FAA under part 61. On the other hand, as far as I know, a foreign-based FAA PPL should be valid as long as the original PPL (it is based on) is valid, without any special additional requirements from the FAA. In my case, my original PPL meets all the requirements by the local authorities in my country. Am I still required to have another flight review, in the US, approved by an FAA-authorized CFI?