They do have and work with eBP from Amsterdam, this time you received a 'Confirmation. This is not a boarding pass!' document.
Because reasons...
Try the KLM site/app or AF site/app as a last ditch effort. If not don't worry too much. Got several of those documents ex-AMS still in my mail-box. Only hope with AF/KLM participating in TSA-Pre now it will happen less for pax with GE/TSA-Pre.