MicrobiomeAnalyst is intended for the comparative analysis of microbiome data. Therefore, we require a minimum of two different taxa at each taxonomy level.
For instance, if you upload a taxonomy table including Phylum - > Species information but only see Species in the “Taxonomy level” drop-down menus, this means that the Phylum, Class, Order, Family and Genus taxa are all the same, and therefore can not be used for comparative analysis.