Getting 404 Page Not Found Error On Portal
If you have a password on your store, this might cause problems. Try removing the password from your store.
Otherwise, try out these steps:
Go to your Shopify admin > Apps.
Click on the About text next to ConvertOut
Make sure your proxy URL is set to /apps/convertout
If it's not, click Customize URL and change it.
If you're still having problems, try uninstalling and reinstalling the app.
If problems still persist, please contact support.