You need not to give IAD for MSC since it has only one interface.
thank you for advice.
Is there nothing to do with the fact that the USB descriptor settings and the USB serial number can not be rewritten?
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You can try using USB UART_SerialNumString function with the composite project available at this link:
If you are unable to change USB serial number, then it may not be possible to do so with multiple classes having Composite device with the API.
thank you for your advice!
I'll continue investigation.