Nginx HTTP to HTTPS redirect only working on one server_name?

I've been trying to get http to https redirect via nginx for the better part of a day, and it's been a struggle. I've checked over several stackoverflow questions, and a number of articles on the internet. I finally got http to https redirect, but only for the direct ip address, not the domain I'm trying to use.

So in other words, http://12.345.67.890 redirects to https://app.example.com, but http://app.example.com does not redirect to https://app.example.com.

Is this expected? What don't I understand here?

My site's config file

upstream appupstream {    server 0.0.0.0:3555;}server {    error_log /var/log/nginx/error.log warn;    listen [::]:80;    listen 80;    server_name app.example.com 12.345.67.890;    return 301 https://$server_name$request_uri;    access_log /var/log/nginx/access.log;    root /home/ec2-user/app/public;    proxy_set_header X-Forwarded-Proto $scheme;    location / {        proxy_set_header X-Real-IP $remote_addr;        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;        proxy_set_header Host $http_host;        proxy_set_header X-NginX-Proxy true;        proxy_pass https://appupstream;    }}

When I curl these sites, the headers seem to support what I'm seeing in my browsers:

IP curl results

$ curl -I -L http://12.345.67.890HTTP/1.1 301 Moved Permanently  // <-- Note the permanent redirect on the ipServer: nginx/1.12.1Date: Sat, 03 Nov 2018 19:30:10 GMTContent-Type: text/htmlContent-Length: 185Connection: keep-aliveLocation: https://app.example.com/HTTP/2 200date: Sat, 03 Nov 2018 19:30:10 GMTcontent-type: text/html; charset=utf-8content-length: 4856x-frame-options: SAMEORIGINx-xss-protection: 1; mode=blockx-content-type-options: nosniffx-download-options: noopenstrict-transport-security: max-age=15778476; includeSubDomainsp3p: ABCDEF

Domain curl results

$ curl -I -L http://app.example.comHTTP/1.1 200 OK                     // <-- No permanent redirect on domainDate: Sat, 03 Nov 2018 19:30:39 GMTContent-Type: text/html; charset=utf-8Content-Length: 4856Connection: keep-aliveX-FRAME-OPTIONS: SAMEORIGINX-XSS-Protection: 1; mode=blockX-Content-Type-Options: nosniffX-Download-Options: noopenStrict-Transport-Security: max-age=15778476; includeSubDomainsP3P: ABCDEF

I've run nginx -t successfully, and I've used both nginx reload and nginx restart each time I've updated the file. I've cleared ALL browsing data (cookies, etc.) and revisited, but this behavior persists. Any suggestions/guidance would be much appreciated!