When processing orders you might come across the "1100148 The Phone Area Code is a mandatory field. Shipping Error" error.
This error is shown when the Ship-to Phone used in an order is missing or does not have a correct format, or the Ship-From phone in the Billing Account profile through which you're processing the order is missing or does not have a correct format.
This article refers to the Ship-To Phone on the order level solution.
For the Ship-From phone solution, refer to: 1100210 Phone Number is invalid. Shipping Error [Solution]
Feel free to follow the step-by-step guide written below or the video guide, as you prefer:
To do so:
1. Find the order through any of the possible ways (after Import Orders, Batches, Order History, etc) as it applies to the case
2. Click the edit button of the order you wish to change
3. Add or Change the Phone accordingly
4. Press Save to apply the changes
If the rest of the information in the order is correct, you will be able to process it.