Breathe will only allow you to have one designated user with Admin permissions. In addition to the Admin role, Breathe also provides other roles such as HR, Finance User, or Holiday Approver, which have specific permissions tailored to complement the Administrator's role.
This is so you have one user who has that sole responsibility for performing sensitive actions such as Purging data, accessing the API or even deleting the account.
If your Admin has left, looking to leave or simply wants to hand over their permission to another user with HR permissions then please follow the guides below...
Additional Information
Partner-Managed Accounts
For accounts managed by a Breathe Partner, the designated Partner serves as the Administrator. You can identify your Partner in the platform by navigating to Help > My HR Consultant.