Amy, You are probably using the default setting "cas.authn.mfa.duo[0].session-storage-type=BROWSER_STORAGE" (see https://apereo.github.io/cas/7.2.x/mfa/DuoSecurity-Authentication.html under optional settings). You need to set cas.authn.mfa.duo[0].session-storage-type=TICKET_REGISTRY or maybe HTTP.
The basic issue is that the web view component presented by the Google app on Android does not have the required JavaScript features that modern browsers do, so the Duo integration fails if you try to maintain the session storage in the browser. Thanks, Carl Waldbieser ITS Lafayette College On Fri, Oct 3, 2025 at 12:11 PM Amy Colfer <[email protected]> wrote: > Hello, we're currently experiencing issues with users logging into > applications via our SSO on Android mobile devices. We're running version > 7.2.7. > > Attached is a screenshot of the error message that appears immediately > after a user signs in—before the Duo authentication prompt is triggered. > > Do you have any insights into what might be causing this? > > -- > - Website: https://apereo.github.io/cas > - List Guidelines: https://goo.gl/1VRrw7 > - Contributions: https://goo.gl/mh7qDG > --- > You received this message because you are subscribed to the Google Groups > "CAS Community" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/a/apereo.org/d/msgid/cas-user/67655a79-5d83-4e0f-b97d-5e2d7eef46a8n%40apereo.org > <https://groups.google.com/a/apereo.org/d/msgid/cas-user/67655a79-5d83-4e0f-b97d-5e2d7eef46a8n%40apereo.org?utm_medium=email&utm_source=footer> > . > -- - Website: https://apereo.github.io/cas - List Guidelines: https://goo.gl/1VRrw7 - Contributions: https://goo.gl/mh7qDG --- You received this message because you are subscribed to the Google Groups "CAS Community" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/apereo.org/d/msgid/cas-user/CALt4NbPGnF5r20qkymjhP3D2%3D22s%2BQoZ9LN7uN_k2xJ-QcnGig%40mail.gmail.com.
