At FSDO Reno, no flight was required since if your current EASA license is valid AND the FAA PPL is based on it, then logically you do not need to do a flight to prove you can fly. This is the policy in Reno
This is a common misconception and is incorrect. Your FSDO need to read FAA Order 8900.1 on the Flight Standards Information Management System (FSIMS) which provides guidance to FSDOs and DPEs on how to issue a FAA license in accordance with 14 CFR 61.75.
FSIMS Document Viewer
Section 14 Issue a Part 61 U.S. Pilot Certificate on the Basis of a Foreign Pilot License
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5-596 PILOT CERTIFICATE REQUIREMENTS.
D. Compliance. A person who is exercising the privileges of his or her U.S. pilot certificate must comply with the pertinent rules and requirements contained in part 61 and in 14 CFR part 91 (e.g., § 61.56 flight review requirements, recency of experience requirements, § 61.58 PIC proficiency check, and § 61.51 required logbook entries). A flight review must have been administered by the holder of an FAA flight instructor certificate with the appropriate ratings. The proficiency checks administered by a foreign flight instructor do not count as meeting the flight review requirements of § 61.56.
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5-603 PROCEDURES. [for the FSDO or DPE to follow when issuing the FAA certificate in accordance with 14 CFR 61.75]
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I. Discuss Relevant Regulations with the Applicant. Advise the applicant about the rules and requirements contained in part 61 and in part 91 (e.g., flight review requirements, recency of experience requirements, and required logbook entries). As a point of emphasis, make clear to the applicant that a flight review (refer to § 61.56) must be administered by the holder of an FAA flight instructor certificate with the appropriate ratings before he or she may exercise the privileges of his or her U.S. pilot certificate. The proficiency checks administered by a foreign flight instructor do not count as meeting the flight review requirements of § 61.56.