@JBreeze, Thanks for posting in Q&A.
For the coming MFA requirement, it is related to Microsoft Entra ID and if the OKTA for MFA has been configured via Microsoft Entra ID, you should contact Microsoft Entra ID support asking for help, also you need to refer to OKTA's documentation or contact their support team for guidance on how to configure this.
Here are some similar threads you can refer.
If we use OKTA for MFA does that cover your requirement for MFA by 10/15? - Microsoft Q&A
Thanks for your kind understanding.
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