Twilio and SendGrid accounts can be integrated through single sign-on (SSO) using Okta as the identity provider. This allows users to securely sign-in to multiple applications with one credential, streamlining the sign-in process for both end-users and organizations. SSO minimizes security risks by centralizing all users to a single platform where roles and permissions can be authorized. Both Twilio and SendGrid support SSO using Security Assertion Markup Language (SAML 2.0) and allow Just-In-Time (JIT) provisioning, which automatically creates user accounts upon sign-in from the identity provider. To implement SSO with Twilio and SendGrid, users need to create an organization in Twilio, configure Okta metadata for Twilio, assign the application to a user in Okta, and test the connection. Similarly, to implement SSO with SendGrid, users need to add the official app integration through Okta's app catalog, configure Okta metadata for SendGrid, assign the application to a user in Okta, and test the connection. The setup also enables JIT provisioning, which automatically creates user accounts upon sign-in from the identity provider.