If you have a problem with biometrics with the notification ‘Failed to verify biometric challenge, signature is invalid’ we recommend that you clear the cache, restart the device and reinstall your Indodax application first. However, if you are still having problems, we can direct you to disable the biometric authentication feature on the INDODAX application first by following the guidelines on the following page : How to Activate Biometric Authentication Feature on INDODAX Mobile App?