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I was able to get this to work by doing the following adjustment (adding string to the variable)

$RootFolder = '/Path/To/Folder'

$folders = Get-PnPFolderItem -FolderSiteRelativeUrl $RootFolder

foreach ($folder in $folders){
    [string] $folderName = $folder.Name
    $user = Get-PnPUser | Where Title -Like "*$folderName*"}
}