Thanks you @dbugger for pointing me in the right direction. @Edmund's answer to this question was the solution to my issue:
https://stackoverflow.com/a/78882862/5161457
Remove the default site if it exists:
sudo rm /etc/nginx/sites-enabled/default
Test your Nginx configuration:
sudo nginx -t
If the test passes, reload Nginx:
sudo systemctl reload nginx
Then retry in 10 mins.