If you've confirmed directly with the partner that there are free spots available due to last-minute cancellations from their direct members for a specific class, and they confirm the spot for you, then yes, you can check in! Just make sure to select "Free Training" after scanning the partner's QR code.
Important: Keep in mind that some partners may not have the "Free Training" feature enabled, so you won’t be able to check in, and the partner won’t be able to add the check-in manually either, which means they won’t be able to charge for your visit. Because of this, we recommend that you only go to the bookings you’ve made through the app to avoid any misunderstandings with the partner.