Thanks for posting your question to the Shopify Community.
I'm sorry to hear you're running into issues regarding your purchase orders not sending. I recommend getting in touch with our QuickBooks Migration Support team directly, so they can thoroughly review this and troubleshoot effectively. For better visibility, I'll share their contact information below.
Quickbooks Migration Support: +1 833 476 1302 Hours Of Operation:Monday - Friday. 9am - 4pm EST
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