Hello everyone and I am sorry I am writing this in English, but for such technical difficulties I do not trust my German.

As the title says, I can’t login on my smart tv (Samsung)

I downloaded the new app from the Apple store, I scanned the Qr code, entered my username and password (which are correct) but it won’t allow me to login into Magenta tv.  For reference I am on the Magenta L and Magenta tv Smart. 
Thank you in advance.

(My customer number, last 6 digits of IBAN and telephone number are in my account settings.)