Error: "[1001] Missing or invalid element: FromPhone."

Shipping services like USPS and UPS check the phone number for shipments.

If the shipment is outgoing, this error should refer to the phone number of the Return Center.

If the shipment is a prepaid label, it could be an invalid customer's phone number. 

Here's what to try: 

- Remove punctuation

- Remove the leading 1 if it's a USA number

- Remove dashes