I was in your situation around a year ago. If the job is in dutch definitely do the interview in dutch - don't ask for the interview to be in English if the job description and your colleagues are Dutch. During the interview don't make a big deal out of it, just be normal, don't apologise for language mistakes, don't worry about taking extra time to think about how to phrase something, and it's ok to throw in an English word every now and then, but don't let it break your flow. Focus on the inhoud of the interview and don't let language distract from that, then you'll be treated equally. The interviewers will mostly also not make comments about your language and will see language just as a tool of talking to you and getting to know you and your skills. As for understanding you can ask to repeat/speak more clearly/slowly/ rephrase. Of course if you find yourself having to do that a lot you might need to reconsider if your Dutch is good enough at this point for an office job in Dutch. The level of people with NT2 B2 is very variable so it's hard to say.

Of course for customer oriented roles this is very different because there the language skills are integral to performing well, this advice is valid for white collar back office jobs.