Hi,
thanks for your reply. In this case bonjour is not required to have it show up since this concerns network discovery only.
Please reset your Cubase preferences.
https://www.steinberg.net/nc/en/support/knowledgebase_new/show_details/kb_show/removing-the-preferences-of-the-sequencer
If this does not help please reset your preferences again, then uninstall an reinstall the remote SKI.
If there are still issues work through the entire Cubase troubleshooting article below please:
WINDOWS
https://www.steinberg.net/nc/en/support/knowledgebase_new/show_details/kb_show/troubleshooting-instructions-for-cubase-nuendo-and-sequel-on-windows
MAC OSX
https://www.steinberg.net/nc/en/support/knowledgebase_new/show_details/kb_show/troubleshooting-instructions-for-cubase-nuendo-and-sequel-on-mac-os-x
All the best.
Phil