Could do with seeing your whole code block and whether you are completing your uow

using (var uow = _unitOfWorkProvider.Create())
{
    var store = _vendrApi.GetStore("xxxx");

    var properties = new Dictionary<string, string>
    {
        {BcnConstants.Commerce.Properties.Customer.Title, context.Record.GetRecordValue(new[] { "title" })},
        {BcnConstants.Commerce.Properties.Customer.FirstName, context.Record.GetRecordValue(new[] { "first_name", "firstName" })},
        {BcnConstants.Commerce.Properties.Customer.LastName, context.Record.GetRecordValue(new[] { "last_name", "lastName", "surname" })},
        {BcnConstants.Commerce.Properties.Customer.Email, context.Record.GetRecordValue(new[] { "email", "email_address", "emailAddress" })},
        {BcnConstants.Commerce.Properties.Other.FormId, context.Form.Id.ToString()},
        {BcnConstants.Commerce.Properties.Other.FormName, context.Form.Name},
        {BcnConstants.Commerce.Properties.Other.RecordId, context.Record.UniqueId.ToString()}
    };
    var orderId = Guid.NewGuid();
    var languageIsoCode = "en-GB";
    var currency = _currencyService.GetCurrency(store.Id, "GBP");
    var taxClass = _taxService.GetTaxClass(store.Id, "standard");
    var orderStatus = _orderStatusService.GetOrderStatus(store.Id, "new");

    // We manually create an order, so that its not stored against the users session
    var order = Order.Create(uow, orderId, store.Id, languageIsoCode, currency.Id, taxClass.Id, orderStatus.Id);

    order.AddProduct(sku, string.Empty, 1, properties);

    var freeShippingMethod = _shippingMethodService.GetShippingMethod(store.Id, "free");
    order.SetShippingMethod(freeShippingMethod.Id);

    var paymentMethod = _paymentMethodService.GetPaymentMethod(store.Id, "zeroValue");
    order.SetPaymentMethod(paymentMethod.Id);

    if (!string.IsNullOrEmpty(context.Record.MemberKey))
    {
        order.AssignToCustomer(context.Record.MemberKey);
    }
    else
    {
        if (_memberManager.Value.IsLoggedIn())
        {
            var member = _memberManager.Value.GetCurrentMemberAsync().Result;
            order.AssignToCustomer(member.Key.ToString());
        }
    }

    order.InitializeTransaction();
    var orderTotal = order.TotalPrice.Value.WithTax;
    order.Finalize(orderTotal, 0, Guid.NewGuid().ToString(), PaymentStatus.Authorized);

    _orderService.SaveOrder(order);

    uow.Complete();

    SetConfirmationUrl(context, pageUrl);

    return WorkflowExecutionStatus.Completed;
}

Hmm, I can’t see a reason why it wouldn’t be persisted. Are you not seeing a value if you fetch the order back?

On a side note, I’d avoid setting the OrderId manually as whilst it accepts a Guid, we actually use COMBs which ensure they are sortable in the database meaning better performance.

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