Configure your okta application as follows:
Next, go to the Sign-on tab and select view setup instructions.
Now copy the, single sign on and single single logout url and paste it to SAMLLoginDestination and SAMLLogoutDestination respectively in your configuration XML.
Next, download the certificate issued by the IDP and save it to your Site/Certificate folder of Community Portal/SynWeb. Next, set the SAMLLoginX509CertificatePath to point to the file. E.g. <SAMLLoginX509CertificatePath>~/Site/Certificates/okta.cert</SAMLLoginX509CertificatePath>
To configure the Single sign out, issue a certificate used to sign the logout request issued by the SP application, then upload it to okta in the Signing Certificate section. Next, using the Config tool, set the SAMLLogoutX509CertificatePath and SAMLLogoutX509CertificatePrivateKeyPassword to the certificate that is issued by the SP.