In my experience, such an error occurs due to dependency mismatch caused by installing apps from wrong channels in conda.
Try to add bioconda and conda-forge to default channels via:
conda config --add channels bioconda
conda config --add channels conda-forge
OR
add a channel specification in qiime2-2021.11-py38-linux-conda.yml:
channels:
- defaults
- conda-forge
- bioconda
Tested QIIME2 2021.11 installation 5h ago on a fresh VM via mamba. All worked smoothly by me without need to modify anything.