q2-aldex2 glm error

I have installed aldex2 in q2-2021.2 (to avoid python version conflict of newer q2 environments)
It runs without problems using example datasets from github as well as with own datasets and the minimal command (only 'required' input and parameters used).
However, there is an error when adding optional parameter --p-test 'glm' (instead of using the default 't' test) to the command line. Any idea how to solve this?

qiime2-q2cli-err-j2adt8ni_log.txt (2.6 KB)

Here's the main error:

aldex.glm: doing glm test based on a model matrix
Fehler in lr2glm(mci_lr, conditions, ...) : 
  Please define the aldex.clr object for a model.matrix 'conditions'.
Ruft auf: aldex -> aldex.glm -> lr2glm

Looks like that's still in development: glm on Aldex2 - formula vs metadata columns

As far as I know, the best way to do this (as of now) is in R. See this example:

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