Found out that there were no change to the quantity which was causing the error.So quantity from [REST]: '/inventory_levels/set.json' = 10 but tried to do [GraphQL]: 'InventorySetOnHandQuantities' = 10 causes error

Trying to set 'on_hand' value using 'InventorySetOnHandQuantities' on a newly created Product.I have tried using [REST]: '/inventory_levels/set.json' before calling the [GraphQL]: 'InventorySetOnHandQuantities'which returns null, but when I try [REST...