It could be an execution policy issue. You could try the following:

1. Run `Get-ExecutionPolicy -List` in PowerShell

2. Take a screenshot or write down your current settings

3. Run `Set-ExecutionPolicy -ExecutionPolicy Unrestricted`

4. Try completing the tutorial again

5. Rerun step 3 with whichever setting you prefer

You can also read about the different execution policy settings here.