SharePoint Online - PowerShell Apply Theme - Problem

Hi Jörg,

this seems to be a quirk in how PowerShell treats the $null input versus the expected [String] parameter. SharePoint can deal with these 2 parameters being null but PowerShell is not happy about it.

I found 2 simple ways of resolving the issue:

1.Pass [NullString]::Value to the function call

$site.ApplyTheme($themeUrl, [NullString]::Value, [NullString]::Value, $false)

2. Pass Out-Null to the function call

$site.ApplyTheme($themeUrl, (Out-Null), (Out-Null), $false)

Both worked fine in my tests.

By the way - I am not a PowerShell expert (I am a SharePoint Developer) but I could find plenty of very complex discussions around passing $null to PowerShell functions - it seems that it is quite complex and not always fully intuitive.

Hope this helps!

Cheers,

Piotrek