First it needs to be used with MSUP (mode super pos.) analysis (say harmonic), so place the command snippet there in the harmonic analysis (not under the modal).
I would try to look at MDAMP in the help apdl command reference guide.
Also try MDAMP,1,0.1,0.1,0.1 to see if the first ~ 1-3 peak go down.
All the best
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