need help getting stock symbols and stock exchange codes

[jeltedeproft]

Is there somewhere a list of stock symbols and stock exchange codes that the application accepts?

I have tried many different ways of adding the DoubleVerify Holdings stock to the application.
If I just add

DV.NYSE

it doesn't work.

When I try one of the suggested examples, like IBM.BE it does work.
But so far I haven't been able to add any of my own.
Am I doing something wrong?

Where can I find stock symbols and stock exchange codes?

Kind regards,
Jelte

[Renato]

In the options/others you can see where the courses are loaded from: http://finance.yahoo.com/echarts?s=%s
You can find the information you are looking for on: https://finance.yahoo.com/