Make sure, that you have downloaded the latest version of Mistertango app.
Delete the application and install it once again.
Turn on the permissions to use camera and microphone.
You could borrow another mobile device for verification from someone.
If the problem persists, please, contact our Support team. Indicate your mobile phone model and operating system version.
Indicate which mobile application version you are using.
If you have the possibility - record your verification process.