This is caused due to the lack of blue band in the sequoia camera, I guess the reflectance panel doesn’t have it either. So when trying to calibrate all bands from P4M, blue is missing.
Also read “The Parrot target does not report reflectance values for the P4M bands. You need to measure them yourself. First, measure the spectral reflectance factor with a spectro-radiometer. Then you need to know the spectral sensitivity of the P4M bands, and using that you can compute the effective nominal reflectance value of the Parrot target for the P4M bands” stated in this thread
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