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