Has anyone has success with the USP assay for fosfomycin?

I am trying to develop a method for the quantification of fosfomycin.  My starting point has been the USP monograph for fosfomycin, but I am detecting nothing.  We are running a 1260 Infinity II Prime with the RID detector.  I am confident that I am injecting comparable amounts to the documented method.  I am using a Polaris 5 NH2 250 x 4.6 mm, 5 um column. Any advice would be welcomed.

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