I think the best way to measure inductor self-resonant frequency is to place it between the VNA ports and find the transmission loss peak. Using just a single port parallels its capacitance with the inductor. This can greatly affect measured SRF. For example, the measured capacitance of 1.9 pF for port 1 of a NanoVNA-H4 exceeds the 1.2 pF calculated self-capacitance of a 10 uH air-wound coil. SRF will measure 28.7 MHz instead of the true 46.1 MHz. No VNA calibration is needed for this measurement.

Brian