So, I looked around the support page and concluded that the 6TB was in fact too good to be true It turns out that the 6TB is yours but you can only use 1TB. The remaining 5 is left to share with others so Google is the better option
edit:
https://www.tenforum...b-per-user.html
The last guy (Kari) explains a workaround. It's a little tedious though so the risk is yours to take
Thanks i will have a look !