Loading Skills with user info

Hi,

Trying to load user skills using C# and/or PowerShell. For now it is left blank even if I include the property in the list, for example with PowerShell:

get-mguser -property "*,Skills" -Filter "mail eq 'email address removed for privacy reasons'" -ConsistencyLevel Eventual | Format-List
If using -Property "Id,Skills" I have a message such as expression id in (<guid value>) is invalid.

For now I'm loading the user and have to make another resquest to load its skills. Seems the issue happens for string[] properties. Anyone knowing how to solve this ?