Proxy Last.FM API 401 Auth Error

I recently found Proxy Last.FM APIs and changed around my host file to see if I could get an old Pandora client I like working again with scrobbling (it had support for Last.FM scrobble submissions back in the day). However, it’s returning a 401 Auth error. I entered my MB ID (‘14Super60pa’) and my access token as mentioned, but I’m only getting 401 errors. Any ideas?