Before connecting Flexport with SellerChamp, make sure your marketplaces are disconnected from Flexport .
The reason why we want to do so is to avoid sending duplicate orders for fulfillment to Flexport.
Here is how you do it:
Go inside your Channels page in Flexport and click on the selling channel.
On the next page, click on the Disconnect Channel option
Now remain logged into Flexport and lets establish a connection to SellerChamp.