nginx: [emerg] "stream" directive is not allowed here
Solution 1:
stream needs to be on the same level as http block so like
http { foo }
stream { bar }
My guess is your include for /etc/nginx/conf.d/*.conf is located in the http {} block and not outside of it. Checkout the /etc/nginx/nginx.conf for the include and maybe you have to make a new one for the stream section