Amazon has minimum requirements on the minimum size of box dimensions and weight.
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For box P2 - B1: The minimum weight requirement is 7.75 lb
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For box P2 - B7: The minimum cubic volume requirement is 354.24 cubic inches
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For box P2 - B8: The minimum cubic volume requirement is 354.24 cubic inches
Not meeting this requirement is resulting into failure on the label generation without any errors from Amazon side.