Hi @MinjaeK.89807 (Customer)​ Thank you for reaching out to the Okta Community! 

Please note that free trial/developer/integrator accounts are only recoverable via self-service provided that you have configured the appropriate policies and backup accounts.  You can also review the recovery process mentioned in this article. 

We strongly recommend configuring test users and groups to be used in conjunction with enrollment/authentication policies that would not apply to your admin accounts.  

If you have a paid production/developer account with us, please leverage it to open a case via the support.okta.com site or call the support line (Customer Support Account ID number required) so our Okta Support colleagues can review the matter. If for whatever reason those options are not available for you, please contact your Okta Account Executive or Customer Success Manager, and they will be able to engage the Support team on your behalf.  

If no paid developer or production account is available,  the only option left is to sign up for a new free trial or integrator account with a new email and leverage those for testing. 

Beyond that, engaging our Okta Sales team to discuss the matter of acquiring Okta Support services would be the only option as it is unfortunately completely outside of the Okta Community Team's scope. 

Regards.

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I suspect that you may have locked out of the tenant. Unless you have valid API key, you may not be able to recover.

You could re-register (use + in emails) for another integrator tenant. Make sure to create additional super admin accounts for backup as break glass.

Keep multiple secondary factors and enabled recovery with factors.