Why won't the fingerprint lock work after restarting Xiaomi Redmi 4?

My phone is locked and I forgot my PIN but after I restarted the fingerprint lock didn't work.

Hi Sidhant. Did you only set 1 finger for the lock? I hope you didn't.. In this case that you can't get in your phone because you locked yourself out, factory resetting it will be they last resort.

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