Device does not support biometric authentication in actually supported devices

Facing the same issue with same device. Try replacing the below class in library and try again.
import android.annotation.TargetApi;
import android.content.Context;
import android.hardware.fingerprint.FingerprintManager;
import android.os.Build;
import android.os.CancellationSignal;
import android.security.keystore.KeyGenParameterSpec;
import android.security.keystore.KeyPermanentlyInvalidatedException;
import android.security.keystore.KeyProperties;

import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.util.UUID;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;

import static android.content.Context.FINGERPRINT_SERVICE;

@TargetApi(Build.VERSION_CODES.M)
public class BiometricManagerV23 {

    private static final String KEY_NAME = UUID.randomUUID().toString();

    private Cipher cipher;
    private KeyStore keyStore;
    private KeyGenerator keyGenerator;
    private FingerprintManager.CryptoObject cryptoObject;

    protected Context context;

    protected String title;
    protected String subtitle;
    protected String description;
    protected String negativeButtonText;
    private BiometricDialogV23 biometricDialogV23;
    protected CancellationSignal mCancellationSignalV23 = new CancellationSignal();

    public void displayBiometricPromptV23(final BiometricCallback biometricCallback) {
        generateKey();

        if (initCipher()) {

            FingerprintManager fingerprintManager;
            fingerprintManager = (FingerprintManager) context.getSystemService(FINGERPRINT_SERVICE);

            cryptoObject = new FingerprintManager.CryptoObject(cipher);

            fingerprintManager.authenticate(cryptoObject, mCancellationSignalV23, 0 /* flags */, new FingerprintManager.AuthenticationCallback() {
                @Override
                public void onAuthenticationError(int errorCode, CharSequence errString) {
                    super.onAuthenticationError(errorCode, errString);
                    updateStatus(String.valueOf(errString));
                    biometricCallback.onAuthenticationError(errorCode, errString);
                }

                @Override
                public void onAuthenticationHelp(int helpCode, CharSequence helpString) {
                    super.onAuthenticationHelp(helpCode, helpString);
                    updateStatus(String.valueOf(helpString));
                    biometricCallback.onAuthenticationHelp(helpCode, helpString);
                }

                @Override
                public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
                    super.onAuthenticationSucceeded(result);
                    dismissDialog();
                    biometricCallback.onAuthenticationSuccessful();
                }

                @Override
                public void onAuthenticationFailed() {
                    super.onAuthenticationFailed();
                    updateStatus(context.getString(R.string.biometric_failed));
                    biometricCallback.onAuthenticationFailed();
                }
            }, null);

            displayBiometricDialog(biometricCallback);
        }
    }

    private void displayBiometricDialog(final BiometricCallback biometricCallback) {
        biometricDialogV23 = new BiometricDialogV23(context, biometricCallback);
        biometricDialogV23.setTitle(title);
        biometricDialogV23.setSubtitle(subtitle);
        biometricDialogV23.setDescription(description);
        biometricDialogV23.setButtonText(negativeButtonText);
        biometricDialogV23.show();
    }

    private void dismissDialog() {
        if (biometricDialogV23 != null) {
            biometricDialogV23.dismiss();
        }
    }

    private void updateStatus(String status) {
        if (biometricDialogV23 != null) {
            biometricDialogV23.updateStatus(status);
        }
    }

    private void generateKey() {
        try {

            keyStore = KeyStore.getInstance("AndroidKeyStore");
            keyStore.load(null);

            keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
            keyGenerator.init(new
                    KeyGenParameterSpec.Builder(KEY_NAME, KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
                    .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
                    .setUserAuthenticationRequired(true)
                    .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7)
                    .build());

            keyGenerator.generateKey();

        } catch (KeyStoreException
                | NoSuchAlgorithmException
                | NoSuchProviderException
                | InvalidAlgorithmParameterException
                | CertificateException
                | IOException exc) {
            exc.printStackTrace();
        }
    }

    private boolean initCipher() {
        try {
            cipher = Cipher.getInstance(
                    KeyProperties.KEY_ALGORITHM_AES + "/"
                            + KeyProperties.BLOCK_MODE_CBC + "/"
                            + KeyProperties.ENCRYPTION_PADDING_PKCS7);

        } catch (NoSuchAlgorithmException |
                NoSuchPaddingException e) {
            throw new RuntimeException("Failed to get Cipher", e);
        }

        try {
            keyStore.load(null);
            SecretKey key = (SecretKey) keyStore.getKey(KEY_NAME,
                    null);
            cipher.init(Cipher.ENCRYPT_MODE, key);
            return true;

        } catch (KeyPermanentlyInvalidatedException e) {
            return false;

        } catch (KeyStoreException | CertificateException
                | UnrecoverableKeyException | IOException
                | NoSuchAlgorithmException | InvalidKeyException e) {

            throw new RuntimeException("Failed to init Cipher", e);
        }
    }
}
anitaa1990 / Biometric-Auth-Sample

Device does not support biometric authentication in actually supported devices #4
