Hi marqo,
Which version of SSMS did you use? Based on my test, SSMS 16 and 17 will use the default version of PowerShell in the machine. Have you checked the default version of PowerShell in your machine? You can use the following code to get it:
$PSVersionTable.PSVersion
Besides, you can use the code "PowerShell -version5.0 -NoLogo -InputFormat text -OutputFormat XML" to switch it, if these cannot help, you can upgradeWindows Management Framework (WMF) again.
Best Regards,
Teige
MSDN Community Support
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