Exe Not Display User defined values in Different system

Question

There are different libraries used in my main project. In one of them there are some values defined, for e.g

m_portnumber = My.Settings.PortNumber

In the My.Settings file PortNumber = 8 and the scope is User. After building the solution, when I ran the application (.exe) in my system, port number = 8 is displaying in UI and working fine.

But the same exe when I run in other systems, the port number values are blank. What can be the reason for this??