What a completely nonresponsive "response". To the best of my knowledge, no one has ever even tried to use auth9n or auth8n. But that's not where the 'n' in authn comes from. authn and authk are both equally distinct from authz.
You appear to be unfamiliar with the extremely common, and problematic, abbreviation "i18n" for "internationalization".
For my part, I have not encountered "authn", "authz", or "authk" before. But prior discussion did not even mention the word "authorization", and that seemed worth bringing out in the open.
So, not nonresponsive, just responsive to things you weren't personally interested in.
