On the Alibaba platform, sub-accounts (also called supplier accounts) are usually created and managed by the main account (supplier). The permissions and functions of the sub-account may be limited by the settings of the main account and the platform rules. If you find that the sub-account cannot place orders and ship on behalf of others, it may be due to the following reasons:

1. Permission restrictions:

- The permissions of the sub-account may be set by the main account to only view and reply to orders, but not to place orders and ship.

- The main account may need to authorize specific order operation permissions to the sub-account, such as by setting sub-account roles and permissions.

2. Rule compliance:

- The Alibaba platform has its own specific transaction rules, and some operations may need to be performed by the main account in person to meet the platform's security and compliance requirements.

- The shipping service may involve third-party intervention, and the platform restricts certain operations of sub-accounts in order to ensure transaction security.

3. Security considerations:

- The platform may restrict the operation of sub-accounts for transaction security reasons to prevent fraud or improper transactions.

- The main account needs to verify the operation of the sub-account to ensure the authenticity and security of the transaction.

4. Product category restrictions:

- Products in certain categories may not support the dropshipping service, and suppliers are required to handle orders and shipments in person.

If you need the sub-account to have the function of placing orders and dropping orders on behalf of others, it is recommended that you:

- Contact the main account and ask them to adjust the permission settings of the sub-account.

- Check the official help center of the Alibaba platform or contact customer service for specific operation guidelines and rules.

- Make sure all operations comply with platform rules and laws and regulations to avoid account restrictions or bans due to illegal operations.

Please note that specific operations and permission settings may change with the platform's policy updates, so it is recommended that you regularly check the platform announcements and help documents to obtain the latest information.