Run Whoami /UPN using RunAsCurrentUser.exe

Content Authoring
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Hi All,

i had problem to get user email using run Whoami /UPN using RunAsCurrentUser.exe
please correct me where i am wrong.

this my script
first tried
waithidden “__Download\RunAsCurrentUser.exe” --w cmd.exe /C echo Whoami /UPN >> d:\default_emailuser.txt

result: file contain text “Whoami /UPN”

2nd Tried
waithidden “__Download\RunAsCurrentUser.exe” --w cmd.exe /C Whoami /UPN >> d:\default_emailuser.txt

result: file blank.

3rd tried
waithidden “__Download\RunAsCurrentUser.exe” --w cmd.exe /C “Whoami /UPN” >> d:\default_emailuser.txt

result: file blank

4th tried
waithidden “__Download\RunAsCurrentUser.exe” --w cmd.exe /C “__Download\default_email.bat” >> d:\default_emailuser.txt

where default_email.bat contain script “Whoami /UPN” >> c:\default_emailuser.txt"

result: file blank

please help how using RunAsCurrentUser.exe to get email user using batch script.

thanks
Lirus