Good day! Our new place already has the necessary equipment and working fiber connection left from the previous owners of the house. I was able to connect to t-mobile.nl website and got the authentication popup asking for customer login and password, which I obviously don't have yet. I would like to get internet up ASAP as it's required for my WFH, but ordering through the website show the delivery date not sooner than 27th of January.
Thanks!
PS: Just got the popup with a questionnaire which blocked the whole page and I had to type most of this message again. 
Before you can enjoy your Internet, thereâs still a couple of steps and work to be done. If you want, I can check what the possibilities are at your address. Please send me your zip code and house number via a private message. With those, I can help you further!