No, you cannot use a subdomain that's already in use on Zendesk. Each subdomain acts as a unique account identifier, so if another company is actively using the subdomain you want, you will encounter an error message stating that the subdomain is taken.
Zendesk does not allow two accounts to share the same subdomain. If you or a colleague previously used the subdomain for an expired trial or a canceled account, you can contact Zendesk Customer Support for assistance. For more details, check out theoriginal link.
If your desired Zendesk subdomain is taken, you will need to choose a different one. Zendesk will suggest an alternative subdomain for you to use. Since each subdomain is a unique identifier for an account, you cannot use a subdomain that is…
As of November 2022, Zendesk can no longer process requests to change the subdomain on a customer's behalf. This means you will need to manage subdomain changes on your own. If you need assistance with a subdomain that was used for an expired trial…