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