Unable to click button using xpath ,name and label in a 3rd party authentication app in IOS

Unable to click button using xpath ,name and label in a 3rd party authentication app in IOS.How to do it?

For me its showing the following error

Element info: {Using=xpath, value=//UIAApplication[1]/UIAWindow[2]/UIAElement[1]/UIAButton[8]} occured while fetching the object