We now support customers that have multiple TikTok Stores associated to one Merchant account.
This means that if a customer has a Store that uses Seller Shipping and a Store that uses TikTok Shipping (Subsidized Labels), they can connect both of them.
You can view our TikTok Knowledge Base article that goes into more details, describing each type of store, how to verify your store, and how to connect your store in ShipHero.