You should use the
FeatureData[Taxonomy] artifact, not the taxa bar plots visualization.
For example, this
FeatureData[Taxonomy], and this
Phylogeny[Rooted] (both from Moving Pictures Tutorial).
Also, I don’t see directions on the itol site for the “zip method” anymore, instead, you simply open the tree, then “add” the taxonomy to it:
Here is a screenshot example using the artifact links above:
And, here is the link to that tree: https://itol.embl.de/tree/10777227216481961570490571 (note to future readers, this link will expire 30 days after being posted here).