Can't Enable a Feature: Value cannot be null. (Parameter 'source')

[fuerro]

Hi,

I'm trying to enable the feature 8a4b8de2-6fd8-41e9-923c-c7c3c00f8295 -> "Open Documents in Client Applications by Default" for all SharePoint Sites a Client has (about 120). Here's what I have so far:

import-module pnp.powershell
Import-Module Microsoft.Online.SharePoint.PowerShell -UseWindowsPowerShell

#Parameters
$SiteURL = "https://xxxxxxx-admin.sharepoint.com"
$FeatureID= "8a4b8de2-6fd8-41e9-923c-c7c3c00f8295" #Open Documents in Client Applications by Default

Connect-SPOService -url $SiteURL

$sites = get-sposite  -limit all

#Connect to SharePoint Online site

foreach ($site in $sites){
    $currentconn = Connect-PnPOnline $site.Url -ClientId "9e6770c0-a6ad-43b3-8c97-0eaaf97f1d37" -ClientSecret "xxxxxxxxxxxxxxxxxxx" -WarningAction Ignore -ReturnConnection
    Enable-PnPFeature -Connection $currentconn -Identity $FeatureID

}

I'm using powershell 7.4, pnp.powershell 2.99.100, Microsoft.Online.SharePoint.PowerShell 1.0. Connection works fine with my EntraID App and I also get something back:

Get-PnPConnection

ConnectionMethod                           : Credentials
ConnectionType                             : O365
InitializationType                         : Unknown
Scopes                                     : 
PSCredential                               : 
ClientId                                   : 9e6770c0-a6ad-43b3-8c97-0eaaf97f1d37
ClientSecret                               : 
ApplicationInsights                        : PnP.PowerShell.ALC.ApplicationInsights
Url                                        : https://xxxx.sharepoint.com/sites/pe-gfw1-esg-xxxx
TenantAdminUrl                             : 
Certificate                                : 
DeleteCertificateFromCacheOnDisconnect     : False
Context                                    : PnP.Framework.PnPClientContext
Tenant                                     : 
UserAssignedManagedIdentityObjectId        : 
UserAssignedManagedIdentityClientId        : 
UserAssignedManagedIdentityAzureResourceId : 
AzureEnvironment                           : Production

Now the problem is whenever I want to enable the feature on the current site, I get the an error:

PS C:\Users\xxxxxxxx\PowerShell> Enable-PnPFeature -Connection $currentconn -Identity $FeatureID -Verbose
Enable-PnPFeature: Value cannot be null. (Parameter 'source')

What's the issue here? Is the connection not good? Am I missing permissions? The same error also happens if I want to use get-pnpfeature. So something with my connection seems to go wrong.

Thanks and kind regards.