Issue generating cert on Debian 10 Linode nginx server

Help
2

Hello all. Bought a domain since my last help topic, think im still missing a few things.

I'm following the guide here: An ASP.NET Core on Linux Tutorial | Linode

At first I got this error:

Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:
  Domain: mjr-stock.xyz
  Type:   connection
  Detail: Fetching http://mjr-stock.xyz/.well-known/acme-challenge/Z_x2hpRYjyDQaxVwdom8UD63-IMwyXlOMkAksS6RQpI: Timeout during connect (likely firewall problem)

Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.

Cleaning up challenges
Some challenges have failed.

after troubleshooting and allowing http via UFW and creating a service file for my application I got the error described in the Main post.

I think im either missing a step - Should my app be running and working on http before doing this step?

else i think the issue might be the proxy_pass value in /etc/nginx/nginx.conf
I wasnt 100% sure what to put here, i tried just my domain at first and got an error, then changed it to the server name i set for the server using hostnamectl set-hostname example-hostname

Thanks for any help

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