If you have trouble logging in apps on your Xiaomi TV Max 86, please refer to the following troubleshooting steps:
1. Ensure that your Xiaomi TV is properly connected to the internet. Weak or unstable internet connectivity can hinder login processes;
2. Turn off your Xiaomi TV, unplug it for a few minutes, and then plug it back in. Turn it on and check if the login works;
3. Ensure you're using the correct Google account credentials to log in. Verify that your account information is accurate;
4. Ensure that the app is the latest version by going to [Apps] >> [Google Play Store] >> [Manage apps & games] >> [Updates];

5. Make sure that your TV's system is the latest version by going to [Settings] >> [About] >> [System Update]. If available, install the updates;
6. If the problem persists, you can perform a factory reset by navigating to [Settings] >> [Device Preferences] >> [Reset]. Be aware that this will erase all settings and data on your TV, so use it as a last resort.
We hope the above methods can resolve the issue. If the issue still persists, you could submit your feedback on your TV by going to [Settings] >> [Device Preferences] >> [Home screen] >> [Send feedback].