You may encounter an issue whereby the Create Tweet button In the Ad Creator is grayed out and you're unable to click on it.
This issue is often due to the fact that a user doesn't have Administrator rights on this account. In order to create tweets via the API, your account must have Administrator rights.
Unfortunately, this is a restriction on Twitter’s end. We’ve created a workaround that allows you to add a second token, with the Administrator right, to your existing account.
Please follow these instructions: