Issue:
Tracking number associated with the MCF order (for the FBA item(s)) is not being updated by Amazon - Amazon MCF issues
Things to check:
Are you able to look up the order and the tracking info on Amazon?
Does the Amazon tracking number begin with something like TBAxxxx ?
If the answer to both the above questions is yes, then Amazon has used a non-standard tracking number for the MCF order, and that is why it is being rejected.
What to do now?
Has the order on original marketplace been updated as shipped?
If the original marketplace order is still not marked as Shipped, then the only solution is to convert the non-standard Amazon MCF tracking number to a tracking number that will be accepted by the original marketplace.
As of right now, in order to avoid these problems, we currently would recommend you signing up for a tracking number converter service, such as aftership. and request them to convert your non-standard Amazon MCF tracking number to a tracking number accepted by the original marketplace.
We do apologize for any inconveniences in advance but rest assured, SellerChamp is working on incorporating a similar service soon.