Hi Joseph, thank you for your question in the Okta community. For this particular issue I'd suggest you open a Support Case so we can confirm the affected email address or addresses and keep it more discrete and secure for you and other users who may be having this issue.

The possible solution is indeed checking if the email address is being blocked on our side.

You can check this document if you need guidance on how to open the support case: https://support.okta.com/help/s/article/How-to-Create-a-Support-Case

Updating post with newer information.  

Please review our Troubleshooting Okta Email Delivery Issues documentation. 

In addition to that please check 

• Unblocking an Email Address From the Okta Email Address Bounce List Using the API
• Remove bounced emails

NOTE: If the API call cannot be completed, contact Okta Support and include the email address that requires clearing.

Regards.

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