I have a WebView widget on my Login page to re-direct to /SSO to go through our MFA. When the handshake is complete and the user is successfully logged in (Log shows: SAML_SSO: Validation is successful), the webview’s onMessage() function is never called. Does the webview onMessage work on iPads?
Can your identity provider support OIDC instead of SAML? The OIDC marketplace module has full support for web and native apps.
Did you pass an attribute to the onMessage callback?