You need to wait until NSFlex has handled your journey. It cannot be done the same day. Have a look at your history at Mijn NS. It may even take some days.

Not checking in may result in a fine of € 50,00 btw, as you do not have a valid ticket.

Hi Thom！Thanks for your reply！However，I have checked my history at Mijn，the trips occurred in June and September without check-in/out also showed the same results. All saidYou cannot yet claim a forgotten check in or check out for a journey with an NS Flex product".

So I have been fined a lot of money because of it. I really hope I can get the money back！

If you can’t resolve this yourself in Mijn NS, then you should contact customer service direcly to ask for a refund. This can be done by phone; they are available 24/7 at 030-751 51 55. You may also contact them by chat (click the link Chat with NS on this page) or by sending a message on Twitter or Facebook. Note that it can take a few days to receive a reply if you contact them online.

Oh thank you Tochjo！It's really useful！