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Read onlyI have added some inventory in FBA since a month, but not a single sale.
Are the sales genuinely down or something wrong with my account?
Account health shows alright too.
That seems strange that you wouldn't have a single sale in a month.
Just sending stuff to FBA is no guarantee it will sell (despite what Amazon emails may say or people on YouTube).
Did you try sell it as FBM first to test the market? I personally would not use FBA without first testing product popularity by trying it at FBM
Do not forget Amazon charges storage fees. If its not selling you will at some point have to decide whether its worth continuing paying the storage fee or pull back.