"Username already exists" but it doesn't!

The way users are managed with Vera is annoying the H*@L out of me. Why is it telling me that the username already exists if it doesn’t? If I create a user and then remove it I can never use the same name again even after a factory reset?

Because UserNames must be globally unique on the MCV server website …

Once created they can not be re-created … You should be able to add your Vera to an existing user.