HUAWEI P20 lite fingerprint sensor not working?

I recently sent my cell phone to Huawei for repairs and when it came back, the fingerprint sensor stopped working because PayPal and Co. Who normally support this tell me why the fingerprint is blocked by the operating system

Re-register fingerprint.

Use alternative PIN.

If nothing helps, back up data Factory setting.

Set up again if that doesn't help then reset your cell phone but save your data beforehand and if that doesn't work then have it repaired or use a pin.

That comes from the repair