Bug? Using DUO protected webmail on mobile WITH DUO app


We have a user that needs to fully access another users shared calendar. To do this that user accesses webmail via Safari on an iPhone. We’ve found that the DUO login fails regularly after we get the DUO notification and switch to the app to approve. Once we switch back to safari (either via the top left link or the double tap home - select safari) we are regularly greeted with a “Safari cannot open this page…”.

I just wanted to see if this is a known issue when using a DUO protected service on the same device you are using to DUO authenticate and switching between the service and DUO app.