Now it's possible
Run the following line at the command prompt of the 64-bit PowerShell command prompt
copy
HKLM:\SOFTWARE\Wow6432Node\Microsoft\PowerShell\1\PowerShellSnapIns\Microsoft.TeamFoundation.PowerShell
HKLM:\SOFTWARE\Microsoft\PowerShell\1\PowerShellSnapIns\Microsoft.TeamFoundation.PowerShell
-r
Then add PSSnapin for Microsoft.TeamFoundation.PowerShell.
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