Unable to create a new organization, GitHub return 500

I’m trying to create a new organization with a free plan for the local hackerspace we have, but all my tries resulted in a server error from GitHub.

The URI that I’m trying to interact with is the https://github.com/account/organizations/new?coupon=&plan=team_free.

I just created a new test org and it was successful,

do you still have the problem?

I’m not sure what the “coupon” part in the URI stands for. If you have a GitHub account (free or otherwise), you should be able to create an organization — no need for coupons.