Lately we are getting reports that starting whitelisted apps in Digital Detox Challenge is not working well for Xiaomi users.. Luckily one of DDC users on Xiaomi did shared a way how to fix it.. (many thanks)
See the screenshots below..
1. First go to phone settings..
2. Open Apps
3. Find DDC in the list
4. Open DDC settings
5. Go to other permissions
6. Enable all.. and starting whitelisted apps on Xiaomi will work