Setting up two-factor authentication?

I'm currently looking into setting up two-factor authentication for all of our users, but I'm a bit uncertain of what is the correct/best way to set this up?

We have RDM with around 50 users and a Devolutions Server 3.0 which is connected to an MS SQL server.

In different locations I'm seeing settings for two-factor, but what is the correct way to set this up? And at what level? On the Devolutions Server, or on the data source?

When I try and setup two-factore on the data source level, and try to select the 'fore data source two-factor authentication' I get an error stating that you need to configure two-factor in the data source before enabling this option, but wasn't that was I was doing? What options do I need to set?

I also tried to configure two-factor on the Devolutions Server, I can configure the two-factor settings, and I guess i need to configure the settings of the users (?), but when I select Manager Users from the Devolutions Server console, the two-factore 'Configure' button of the users doesn't seem to do anything.

When I go to Administration / Users and go to a user and click on 'Configure' I get an 'Object reference not set to an instance of an object' error:


NullReferenceException - Object reference not set to an instance of an object.

at DevExpress.XtraPrinting.Native.IEnumerableExtensions.ForEach[T](IEnumerable`1 en, Action`1 action)
at Devolutions.RemoteDesktopManager.Forms.FrmTwoFactorConfiguration.c69ae3f3c12239a7b16bed0123734a3a2(Object c19f185fd70cefc696ba148af1c4faf54, EventArgs cf1018bb83ec7debd818319fd3cb4844e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at Devolutions.RemoteDesktopManager.Forms.FrmBase.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)