Kindly check that your device timing has been synced with your Authentication App with these steps:
For Android devices
Select the button on the top right hand corner > Select "Settings" > Select "Time correction for codes" > Select "Sync now"
For iOS devices
Go to the "iPhone Settings App > Select "General" > Select "Date & Time" > Enable "Set Automatically"
(If it is already enabled, disable it, wait a few seconds and re-enable.)
If you find that the time is synced, kindly try again.
If you require further information, do not hesitate to contact us here.