Hi Mahsa and welcome to the NS Community.

I'm very sorry to read you're having trouble logging into the app. Have you contacted our Customer Service about this yet? They can take a look at your account and maybe figure out what is going wrong. It's also possible to contact App Support in the app itself if you suspect it's a fault in the app, given you say you can log into the website. Hopefully it will be resolved for you quickly either way!

This is usually because of special characters in your password, like <>&# or other. The ! or ? should work.

i still can not ‘inloggen>’ in MIJN NS. I hv something else then i get u. ???

Btw, there are several MIJ NS inloggen in google. NBut which one that i must choose  from Google

Here's a direct link to Mijn NS where you can log in!

The one with the e-mail address that receives invoices.