Create a team fails with 500

I'm unable to create a team from the using neither the https://bitbucket.org/account/create-team/ nor the https://bitbucket.org/account/signup/ page. After filling out the form and hitting "Create" I get a 500 error. My user account is the only member of the team in both cases:

Here are the error tokens from each attempt:

https://bitbucket.org/account/create-team/ attempt
c83e8f15211546619bebb0e1867ad7d8

https://bitbucket.org/account/signup/ attempt
4f1df126841541c3b50137cdd8fb0a02