If you can’t publish applications from Citrix Studio successfully, you may need to look into your certificate.
If you have Transport type set to HTTPS (in Storefront under Manager Delivery Controllers, Edit Store\Site), try flipping it to HTTP. If that works it indicates you likely have an SSL issue. You need to have a valid certificate across all delivery controllers. You also need to configure the binding in IIS as per the article: https://support.citrix.com/article/CTX215807
It’s also possible that apps won’t appear if filters have been configured in your environment: https://www.citrix.com/blogs/2014/03/27/hiding-applications-in-citrix-storefront/