Okta is capable of sending DMARC compliant email because they support custom SPF and DKIM configurations that achieve DMARC alignment. Okta is a Security Platform and is often used by Network, Security and Email Administrators.
The link just below is a resource on how to configure this source to send DKIM-aligned email on your behalf. You will complete this configuration by (1) following the source's instructions and (2) adding the required entries into your DNS. https://help.okta.com/en-us/Content/Topics/Settings/Settings_Configure_A_Custom_Email_Domain.htm
The link just below is a resource on how to configure this source to send SPF-aligned email on your behalf. You will complete this configuration by (1) following the source's instructions and (2) adding the required entries into your DNS. https://help.okta.com/en-us/Content/Topics/Settings/Settings_Configure_A_Custom_Email_Domain.htm