Client tries to retrieve fundamental data (e.g. TR.F.EPSBASICEXCLEXORDITEMSCOMTOT(PERIOD=FY0)) for more RICs, for example 20, the API returns a series of ?<NA>?"

This was working yesterday, and has stopped working today.

The below works fine:

df, err = ek.get_data(['WBC.AX','ANZ.AX','A2M.AX'], ['TR.F.EPSBASICEXCLEXORDITEMSCOMTOT(PERIOD=FY0)'])

df

The below returns NA.

df, err = ek.get_data(['WBC.AX','ANZ.AX','A2M.AX','AGL.AX','ALD.AX','ALL.AX','AMC.AX','APA.AX','APT.AX','ASX.AX','AZJ.AX','BHP.AX','BXB.AX','COH.AX','COL.AX','CPU.AX','CSL.AX'], ['TR.F.EPSBASICEXCLEXORDITEMSCOMTOT'])

df