...
When trying to sign into a service that requires Duo 2FA from an iPhone or iPad, users who use that same device for Duo verification may open the Duo app to verify the sign-in attempt. After returning to their original app (Safari, etc.), they may see that the page is still waiting for the 2FA verification, even though they just completed it.
...
Workaround
| Tip |
|---|
The issue does not appear to occur on devices running iOS 18.2 or newer. Be sure to keep your device fully up-to-date by checking for available updates in the Settings app. |
Usually, waiting enough time will eventually allow the verification to be detected and your sign-in will continue as normal. However, you can follow these instructions to avoid the problem in the future.
...