void HandleActivationError(string key, string errorMessage)
        {
            if (errorMessage.Contains("is not valid") ||
                errorMessage.Contains("nu este valid"))
            {
                logger.Debug(
                    MyOperation.KeyActivation,
                    OperationStatus.Failure,
                    "Invalid product key",
                    new LogInfo(MyLogInfoKey.KeyCode, key));

                keyHandler.MarkKeyAsInvalid(key);
                return;
            }

            if (errorMessage.Contains("activated by a different Steam account") ||
                errorMessage.Contains("activat de un cont Steam diferit"))
            {
                logger.Debug(
                    MyOperation.KeyActivation,
                    OperationStatus.Failure,
                    "Key already activated by a different account",
                    new LogInfo(MyLogInfoKey.KeyCode, key));

                keyHandler.MarkKeyAsUsedBySomeoneElse(key);
                return;
            }

            if (errorMessage.Contains("This Steam account already owns the product") ||
                errorMessage.Contains("Contul acesta Steam deține deja produsul"))
            {
                logger.Debug(
                    MyOperation.KeyActivation,
                    OperationStatus.Failure,
                    "Product already owned by this account",
                    new LogInfo(MyLogInfoKey.KeyCode, key));

                keyHandler.MarkKeyAsAlreadyOwned(key);
                return;
            }

            if (errorMessage.Contains("requires ownership of another product") ||
                errorMessage.Contains("necesită deținerea unui alt produs"))
            {
                logger.Debug(
                    MyOperation.KeyActivation,
                    OperationStatus.Failure,
                    "A base product is required in order to activate this key",
                    new LogInfo(MyLogInfoKey.KeyCode, key));

                keyHandler.MarkKeyAsRequiresBaseProduct(key);
                return;
            }

            if (errorMessage.Contains("this product is not available for purchase in this country") ||
                errorMessage.Contains("acest produs nu este disponibil pentru achiziție în această țară"))
            {
                logger.Debug(
                    MyOperation.KeyActivation,
                    OperationStatus.Failure,
                    "The key is locked to a specific region",
                    new LogInfo(MyLogInfoKey.KeyCode, key));

                keyHandler.MarkKeyAsRegionLocked(key);
                return;
            }

            if (errorMessage.Contains("too many recent activation attempts") ||
                errorMessage.Contains("prea multe încercări de activare recente"))
            {
                logger.Debug(
                    MyOperation.KeyActivation,
                    OperationStatus.Failure,
                    "Key activation limit reached",
                    new LogInfo(MyLogInfoKey.KeyCode, key));
                return;
            }

            if (errorMessage.Contains("An unexpected error has occurred") ||
                errorMessage.Contains("A apărut o eroare neașteptată"))
            {
                logger.Debug(
                    MyOperation.KeyActivation,
                    OperationStatus.Failure,
                    "An unexpected error has occurred",
                    new LogInfo(MyLogInfoKey.KeyCode, key));
                return;
            }

            throw new FormatException($"Unrecognised error message: \"{errorMessage}\"");
        }