In this post, you’ll learn about the error code “0x803F6100” that is returned while you are developing or testing Store-related operations in your Windows app
Windows Store Error Message
0x803F6100
Error Description
Below is the description of this Windows Store Error.
The in-app purchase could not be completed because Kid’s Corner is active. To complete the purchase, sign in to the device with your Microsoft account and run the application again.