getting null when validate with token can any oine help me to find what exactly issue

[nipu-softic]

 generateRandomBase32 = () => {
    const buffer = crypto.randomBytes(15);
    const base32 = encode(buffer).replace(/=/g, '').substring(0, 24);
    return base32;
  };

  totpGenerate(secret: string): OTPAuth.TOTP {
    const totp = new OTPAuth.TOTP({
      issuer: Config.ISSUER,
      label: Config.LABEL,
      algorithm: Config.ALGORITHM,
      digits: Number(Config.DIGIT),
      period: Number(Config.PERIOD),
      secret: secret,
    });
    return totp;
  }
async enable2FA(towFAEnableDto: TowFAEnableDto) {
    try {
      const user = await this.userRepository.find({
        uuid: towFAEnableDto.userUuid,
      });

      if (!user) {
        throw new NotFoundException('User Not found');
      }
      const secret = this.generateRandomBase32();

      /**
       * TOTP: Time-based One-time Password
       */
      const totp = this.totpGenerate(secret);
      const url = totp.toString();
      const payload = await this.towFARepository.createOrUpdate(user.uuid, {
        appAuthUrl: url,
        secret: secret,
        enable: towFAEnableDto.enable,
        authType: towFAEnableDto.authType,
      });
      return payload;
    } catch (error) {
      throw errorHandler(error);
    }
  }

  async login2fa({ userUuid, token }: Login2faDto) {
    try {
      let user: any = await this.userRepository.find({
        uuid: userUuid,
        softDelete: false,
      });

      user = this.exclude(user, ['password']);

      if (!user) {
        throw new NotFoundException('Invalid user');
      }
      const totp = this.totpGenerate(user.towFa.secret);
      // const t = totp.generate();
      const delta = totp.validate({ token });
      if (delta === null) throw new NotFoundException('Invalid OTP');
      return true;
    } catch (error) {
      throw errorHandler(error);
    }
  }