Have this settings for sitemap:
in dev mode and in production mode (npm start) can see /sitemap.xml, but when deploy have this error:
Nuxt.js Internal Server Error
Your sitemap config is good.
On which platform did you deploy your app?
can you share your complete server error logs?
wich versions do you use for:
The problem is now (Zeit) deploy. I migrated on netlify
I understand the hustle, but please try this link.
That worked for me