IAP Testing

We are testing in-app pruchase (IAP) in sandbox.
Several product we've register in apple console and can be purchase using ios device.
But when I tried to use other ios device (ipad) there is error message during [purchase] mentioned "not found" but the product name and price listed below the message,

[]not found

[the product name] [product price]

I wonder why the "not found " appear while the product name and price is shown and we can do the product purchase.

Appreciated for the help

regards,
IAP Testing
 
 
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