Change taskbar icon of slate application

Hey guys

So we have a tool built using slate and that tool taskbar icon use to be custom but since we upgraded to Unreal 4.26 it now the standard Unreal Icon and I can’t figure out how to change it (I didn’t built the tool). This is a stand alone slate application so I don’t have the same options as the normal Unreal editor.

Any help would be much appreciated

Thanks in advance.