You may have trouble receiving push requests if there are network issues between your phone and our service. Many phones have trouble determining whether to use the WiFi or cellular data channel when checking for push requests, and simply turning the phone to airplane mode and back to normal operating mode again often resolves these sort of issues, if there is a reliable internet connection available. Similarly, the issue may be resolved by turning off the WiFi connection on your device and using the cellular data connection.
Note: Try first by opening the Duo app to see if options for "Approve or Deny" are displayed. See to troubleshoot steps for both Android and iOS mobile phones.
Android:
https://help.duo.com/s/article/2050?language=en_US&_ga=2.263637580.1766246518.1719322960-703566370.1716397193&_gac=1.153355722.1719326815.CjwKCAjw1emzBhB8EiwAHwZZxT432fGcwtemsW9QfhIjfncUMXbEITd1EfqQqP3CUreKLjLwey7I0RoC6UYQAvD_BwE
iOS Apple:
https://help.duo.com/s/article/2051?language=en_US&_ga=2.71272784.1766246518.1719322960-703566370.1716397193&_gac=1.85549547.1719326815.CjwKCAjw1emzBhB8EiwAHwZZxT432fGcwtemsW9QfhIjfncUMXbEITd1EfqQqP3CUreKLjLwey7I0RoC6UYQAvD_BwE