Why is the The Office series no longer available on Netflix?

Where can you watch the series?

And do you think the last seasons will also be dubbed in German?

Certainly license expired

Since the series (6 seasons) is now available for purchase on Amazon Video and iTunes, you can assume that Netflix no longer has any rights to show the series.

Here's a look at where the series is currently being streamed:

https://www.werstreamt.es/...he-office/

The 6 seasons are available in German, so they are already synchronized.