The other day I got a little over excited by the fact Microsoft had announced Forms for commercial 365 customers. So off I went to https://forms.office.com/ only to be presented with this:
So after grumbling for a few minutes I decided to have a look at the portal and forms was enabled. So now I was even more confused:
Stupidly I was assigned the wrong licence in 365 so I changed it to the correct E3 Enterprise and then everything worked
Note, some subscriptions may not be active until September 2017.