I also ran into this problem. The issue is that Bioconda does not support the osx-arm64 build platform, so you can't get Apple Silicon software from there.
(The good news is that conda-forge does support M1 macs, so a native version of Qiime2 is possible! But no one has built it yet)
The current solution is to install the x86 version of miniconda so Roseta2 can emulate it. Check out this guide!
