Thanks for sharing! Now that we can read the full error message, we can try to pull the thread.
It looks that your error is similar to the one discussed here:
In that post, the error is solved by removing the contents of the .condarc file¹ and reinstalling the environment. Sometimes the setup included in .condarc conflicts with the way QIIME 2 installs plugins.
I would try to remove the content of .condarc (i.e. leave it blank) and then delete and reinstall the QIIME 2 environment.
Good luck!
--
¹ The .condarc file should be located in your home directory.