This may only work if you purchased the game through the microsoft store! Also this will reset you at your current mission and you will lose checkpoints or at least I did. But this is way better than restarting your entire campaign!
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Go to:
C:\Users\zanew\AppData\Local\Packages\Microsoft.GanderBaseGame_8wekyb3d8bbwe\SystemAppData\wgs\0009000005AF27F0_0000000000000000000000006052E99B\417FE3826FE04C01ADAA387D5662D52C2. -
Delete the first 2 documents and then restart the application! & continue campaign and it should work like it did for me!
I hope this helps you as it did me!
