Thanks, Carl! We're currently on version 7.2.7, and from what we've found, 
it looks like this feature is only available starting in 7.3. Do you happen 
to know of any workarounds or alternative approaches that might work 
without upgrading?
On Friday, October 3, 2025 at 12:50:24 PM UTC-4 Carl Waldbieser wrote:

> 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?
>>
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