“Hard120200 Missing or invalid ship from company name” error message appears because of the character limits defined by UPS for company name on your Ship From address. For this reason, UPS Ship From company names have to include a maximum of 35 chars (including spaces).
Also you need to change the Customer name from the Shipment order screen, you will first go to edit mode by clicking the edit button at the top of the screen, then double click to Customer field. On the popped up screen you can change the customer name.
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