Revolut won’t install on iplay70 mini pro

To install the Revolut app on my iplay70 mini pro I need to take a selfie, but the camera app won’t start…. Done several actions to solve it with help of service of revolut… Nothing helps…. Seems a problem of the user interface of the fablet…  Has anyone better results?

Can the built-in camera app of the machine be opened normally by itself? Can other apps call the camera app normally to take photos?
You can first clear the cache of the storage data cable of the camera app and the app you mentioned, and then re-authorize when running the app