Cannot create repository with REST API

I'm trying to create a repository via REST but it's not working. I believe the request is correct because I'm using the Apigee console you provided, using the standard settings. Here are the steps to reproduce:

1. Select basic auth and enter credentials
2. Try 'GET user/' to make sure the credentials are correct
3. From the left panel, select 'POST repositories/'
4. In the 'Template' tab, enter required field 'accountname' (easycompanyit) + 'repo_slug' (test006)
5. In the 'Body' tab, enter required field 'name' (test006)
6. Click 'send'

The request can be viewed here: https://snap.apigee.com/TX9qKK#content=request\\
The response here: https://snap.apigee.com/TX9qKK

Thanks already!

Rolf