> For the complete documentation index, see [llms.txt](https://docs-connector.ecomsend.com/ecomsend-connector/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-connector.ecomsend.com/ecomsend-connector/orders-and-fulfillments/sync-fulfillment/fulfillment-sync-failed.md).
# Fulfillment sync failed?
When syncing fulfillments from TikTok Shop (TTS) to Shopify via EcomSend Connector, you may see the following sync statuses:
* **Not synced:** The fulfillment has not been synced yet.
* **Synced:** The fulfillment has been successfully synced via EcomSend Connector.
* **Sync failed:** EcomSend Connector attempted to sync the order but failed.
👉 For fulfillments that failed to sync, **click the failed badge** to view detailed information. Follow the instructions to identify the issue, make updates, and then re-sync the fulfillment.
If you have any questions, please feel free to contact our professional 24/7 support team.
***
## Common failure examples and solutions
**Reason:** Your carrier \*\* is not included in TikTok Shop’s list of integrated carriers.
**Solution:** TikTok Shop **only supports** shipments handled by carriers that are [**officially integrated**](https://seller-us.tiktok.com/university/essay?knowledge_id=8308896260065025\&role=1\&course_type=1\&from=search%7BcontentIdParams%7D\&identity=1\&anchor_link=EB7F00D0) with the platform. Please use one of the supported carriers.\
If your carrier *is* supported by TikTok Shop but appears under a different name in Shopify, you can use our [**Carrier Mapping**](/ecomsend-connector/settings/order-and-fulfillment-sync-settings.md#sync-rules) feature to link them correctly.
***
**Reason:** The tracking number can only be updated once.
**Solution:** TikTok Shop allows each tracking number to be updated **only once**, and the update must occur **within 72 hours** of fulfillment.\
If you need to change the tracking number again after that window, please **contact TikTok Shop support** for assistance.
***
**Reason:** TikTok order line items are already fulfilled with different items, cannot create new fulfillment
**Solution:** If you need to proceed with a new fulfillment, please **contact TikTok Shop suppor**t to **cancel the previous fulfillment**, then resync the order afterward.
**Need help?** Feel free to contact us via online chat or [email](mailto:undefined). Our world-class support team is available 24/7 and always ready to assist you. 🌻
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs-connector.ecomsend.com/ecomsend-connector/orders-and-fulfillments/sync-fulfillment/fulfillment-sync-failed.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.