Is it possible to customize the text on Fslogix message box if it fails during the logon (and make it more understandable for the end user?)

Is it possible to customize the text on Fslogix message box if it fails during the logon (and make it more understandable for the end user?)

Ok, found a registry setting from archived forum.
"In addition to the policies you have to set a two registry keys in HKLM\Software\FSLogix\Profiles
ShellDisplayText (Reg_SZ)
The value is the message you want to show to your users."
Any text saved in this registry key replaces the first line of the message box.
Does this work now?
It tried to add it via GPO to Computer configuration -> Registry -> Aktion is Update but does not affect the message.
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