Maybe you are using v4 of Tailwind, which does not use init, but this instead:

npm install tailwindcss @tailwindcss/vite

https://tailwindcss.com/docs/installation/using-vite

Version 3.4 uses this:

npm install -D tailwindcss@3
npx tailwindcss init

https://v3.tailwindcss.com/docs/installation