Check D-Day History app permissions. If any of these permissions required to use your device's features are disenabled, D-Day History might not work.
Uninstall and reinstall D-Day History. If nothing else has worked, completely uninstall D-Day History then reinstall.
Restart your device. Last, restarting your device can often clear most problems causing D-Day History not working
2. Fix D-Day History Server issues & Internet Connection
Check network connection: An unstable Internet will make D-Day History be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
Disable VPN: VPN can cause connection errors and lead to D-Day History not working. Make sure all VPNs are off
Enable background data: When Background data is turned off, D-Day History may not be able to connect to the Internet when running in the background.
Reported Issues
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