I wanted to order MP2672AGD-0000-Z (Dist part number:1589-MP2672AGD-0000-ZCT-ND) to use with the PCB assembly service but it got rejected with the message "The part has been cancelled because it's unable to be assembled". Is there any specific reason why it cannot be assembled?
It doesn't have a C number because it is a globally sourced part. There is a record in the smt library database with the code "C3681494" but it's probably a placeholder as it never had stocked.
Hello, the system will ask you to cancel because this can not be tiled.
@haidy_easyeda,
The part number:
1589-MP2672AGD-0000-ZCT-ND
is not an LCSC part number, it is a part supplied by DigiKey.
Presumably the OP has called this up as part of JLCPCBs global Sourcing feature.
@berkaygursoy,
I can't help you directly but you might like to check these pages and then contact JLCPCB support directly:
https://jlcpcb.com/help/article/60-How-to-use-JLCPCB-Global-Sourcing-Parts-Service
https://jlcpcb.com/help/contact
:)
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Hello, could you please tell me the "C number" of this component? This is shown in the figure below.