When specifying verbose preference this will only be inherited by the scripts module functions, if specified in the global scope.
However, it is possible to use an advanced function to access the variable preference using the ‘$PSCmdlet.GetVariableValue()’ method to access the SessionState object and inherit the preference value.
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|$VerbosePreference = $PSCmdlet.GetVariableValue('VerbosePreference')|
The important part of the above is that the parameter block contains [CmdletBinding()] attributes, without this the $PSCmdlet value will be null.