Forwarding .nro files on switch technically works but it won't let me boot off of it. Sad. Oh well still pretty much got everything working so it's a victory. Maybe in the near future the switch homebrew community will make something that makes nro forwarding work better
Discussion
Are you on fw 19? Some Nintendo changes broke forwarders. Check the last page on this thread. https://gbatemp.net/threads/nsp-forwarder-generator-an-online-tool-to-create-nro-retroarch-forwarders.630368/
This should work for fw 19 in the meantime.
https://nsp-forwarder-git-fork-masagrator-main-tootallteam.vercel.app/
Yeah I'm on 19, I tried this and it technically put the application on my home screen but when I click it it just says NO
NRO forwarding was fixed, awesome now my dad has all his emulated games listed as official games on the home screen of his switch