I've got the same error with customers also reporting the issue. It's happening on version 4.40.3
I've run NC locally and added a breakpoint in the CheckoutController in OpcSaveBilling. I can see that the ModelState is invalid, and it's due to the property BillingNewAddress.Id. The error for the property is 'Admin.Common.Validation.NotEmpty'
Can anyone help out with what this means? Is the form posting data that the OpcSaveBilling method does not expect?
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