isCancelled should be set to true as a initial value

Thanks for your share firstly.
Before start authenticate every time, we should check the FingerPrint whether is started, if yes, cancel it. So if do cancel when FingerPrint is not started, we will get an error.
In general, the status of service should always be cleared or closed before service is started.
is it right?

Locate the authentication entry point and the isCancelled state referenced in the issue, then trace the cancellation path before fingerprint authentication starts. Reproduce the error when cancellation is attempted before the service starts; done means the initial service state is handled consistently without that error.

Written by the indexing model from the issue text.