How can I transfer ownership of my Support account?
If you don't already know who is the current owner of your account, you can find out as described in this article: Finding the account owner.
If the current owner is available, they can transfer ownership to the new owner from within the product directly. You can see the steps on how to transfer ownership in this article: Transferring ownership.
If the current owner is no longer with your company or not available, you can request Zendesk customer support make the ownership change for you following a quick security procedure described in this article: Asking Zendesk to change the account owner.