As you may know orders can be sent to outside vendors. This process can be done manually in the order area or automatically by product. If the vendor is not receiving the email notifications, it could happen for few reasons mentioned below:
1. Vendors’ email is incorrect. In this case, you have to fix the email address on Preferences > Vendor > Email and enter a valid email address.
2. The order is received but not Approved. In this case, you have to make sure the item on the order is approved. This is a very common scenario in B2B sites where Approval Plans are set. For this reason, once an item is approved by an approver, the notification will be sent to the vendor.