List SharePoint Sites, their Libraries, their folders, and their Permissions for Given User

xoxidein 

To achieve the desired output, you need to loop through each site collection, and for each site collection, you need to get all the document libraries and loop through each library to get the associated permissions.

This script modification might help you.

#Set Parameter
$TenantSiteURL="https://contoso.sharepoint.com"
  
#Connect to the Tenant site
Connect-PnPOnline -Url $TenantSiteURL -Credentials (Get-Credential)

#Get All Site collections - Exclude: Seach Center, Redirect site, Mysite Host, App Catalog, Content Type Hub, eDiscovery and Bot Sites
$SiteCollections = Get-PnPTenantSite | Where -Property Template -NotIn ("SRCHCEN#0", "REDIRECTSITE#0", "SPSMSITEHOST#0", "APPCATALOG#0", "POINTPUBLISHINGHUB#0", "EDISC#0", "STS#-1")

#Loop through each site collection
ForEach($Site in $SiteCollections)
{
    Write-Host ""
    Write-Host "Site: $($Site.Title)"

    #Get all document libraries
    $DocLibs = Get-PnPList -Web $Site.Url -Template "DocumentLibrary"

    #Loop through each library to get permissions
    ForEach($Lib in $DocLibs)
    {
        $Permissions = Get-PnPProperty -ClientObject $Lib -Property EffectiveBasePermissions

        #Loop through each permission level and output the library and permission
        ForEach($Perm in $Permissions)
        {
            $PermLevels = $Perm.FieldValues

            #Check if the user has any permission on the library
            If(($PermLevels.FullMask -band [Microsoft.SharePoint.Client.PermissionKind]::ViewListItems) -ne 0)
            {
                Write-Host "`t$($Lib.Title)`t`tRead"
            }
            If(($PermLevels.FullMask -band [Microsoft.SharePoint.Client.PermissionKind]::EditListItems) -ne 0)
            {
                Write-Host "`t$($Lib.Title)`t`tContribute"
            }
            If(($PermLevels.FullMask -band [Microsoft.SharePoint.Client.PermissionKind]::DeleteListItems) -ne 0)
            {
                Write-Host "`t$($Lib.Title)`t`tDelete"
            }
            If(($PermLevels.FullMask -band [Microsoft.SharePoint.Client.PermissionKind]::ManagePermissions) -ne 0)
            {
                Write-Host "`t$($Lib.Title)`t`tFull Control"
            }
        }
    }
}

This script loops through each site collection, gets all the document libraries, and then loops through each library to get the permissions. It then outputs the library name and associated permission level for each library that has any permission. You can modify this script to output the results to a CSV file or format it in any way you like.