Unable to create world on realms

Put the summary of the bug you're having here
I can't create a world on Realms even though I logged on to my mojang account
*What I expected to happen was...: That after I hit the create button, my world would be created

*What actually happened was...: When I hit create, it just took me back to te realms screen

Steps to Reproduce:
1. Go to play on realms
2. New
3. Put all the information and hit create
4. It will take you back to te realm screen on step 2