Try using the signal finder option, in the tuner menu.
The only way you are going to sort this is to check everything, do not take it as automatic that just because it works on the VU+ Zero it will work on the VU+ Uno 4k, it should do but it's always best to check.
Is your VU+ Zero running original firmware?
You can view the satellites.xml file by using Filezilla.
Connect Filezilla, to your receiver, using the receivers IP address, on your PC, username is root and the password left blank..
On the right hand side, of the PC screen, you should be able to see all the files, on your VU+.
Click the + sign, navigate to the etc folder, and locate satellites.xml.
Copy this file to your PC, by right clicking on it, and download, preferably to your desktop, so it's easier to find, then open it with Office Excel, or other program, and check the 23.5E listings.