This would be appear to be a Citrix - compatibility issue and what I have read on the Citrix blogs and forums leads me to believe that Citrix engineers need to upgrade and release new versions of the certificate. I have a similar issue and got a temporary workaround by using Chrome (Google browser) and downloading the Citrix workspace extension for it. (None exists for Safari yet) and my applications were able to run. I had to learn how to juggle between multiple applications as Option + Tab does not work but did it by using different window sizes and desktops and switching as necessary. Hope someone else can be helped as well.
The Workspace app is transparent to the driver. It gets the postscript data from VDA and forwards it to the available printers without altering the data or settings. In this example, we have simulated the same core printing APIs used in Citrix Workspace app for Mac. Use the sample, select a file, and print. If this sample is able to print, then. Issues on Citrix Workspace App for Mac after upgrading to Mac OS Catalina. Contact Support PRODUCT ISSUES Open or view cases; Chat live. The Citrix Workspace app allows for secure, unified access to all of your SaaS apps, web apps, virtual apps, files, and desktops. If your company uses Citrix, simply login with your company credentials to access all of the resources you need to be productive from anywhere. Posted March 31, 2020. Having the same issue connecting Workspace app on macOS Catalina. 'Citrix Workspace cannot connect to the server. Check your network connection.' MacOS Catalina 10.15.4 and Workspace App 20.02.0.5. And other Mac with Workspace app 19.12.0.23. It has to be an issue with the latest Catalina updates.
By the way - Citirix did update its app right after Catalina was in general release and new(er) workspace app icon is blue as compared to the prior black one. That is the one you want to download if you are going to try the Chrome route.
Just found this out - Citrix released a new Workspace for Mac - you can download it here: https://www.citrix.com/downloads/workspace-app/mac/workspace-app-for-mac-latest.html
El capitan for unsupported macs. My apps are now working - no more certificate errors
Citrix Receiver
Oct 13, 2019 12:40 PM