Unfortunately, we do not have a solution in place to free up @BenLubar from the existing account so that you can add this account to the team account. I understand that this is a major inconvenience and apologize for the situation. We have resolved the bug that contributed to this situation in the first place.
Our team is going to continue working on a solution for this situation, but in the meantime, the best path forward is for you to create a new @handle and invite that handle to the team account. When you receive the email inviting you to the team account, the ‘Accept invitation’ button will automatically provide you access to that team account.
Please let me know if you have any questions.