There are several reasons why an order is put On Hold status. Here are the list of possible reasons.

• Customer has not paid for the order
• Out of Stock
• Missing Line Items
• Missing Billing Address
• Missing Shipping Address
• Missing Currency
• Missing Total Order Price
• Order Value is Zero or Negative
• Missing Customer Name
• Missing Phone Number
• Missing Email address
• Missing Zip Code
• Missing Shipping Country
• Missing Shipping City
• No Corresponding Variant
• Missing SKU code
• Missing Product Name
• Missing Product Value
• Product Line Item Quantity Missing or Less Than or Equal to Zero
• Missing CNID
• Verifying CNID
• Invalid CNID