This video will show you how to fix Alt+tab not working in Windows 10. Here are the steps:
1. Make sure you have enabled the App Switching feature
2. Make sure that Peek option is enabled
3. Disconnect your peripherals
4. Modifying Registry Values
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
In the left pane, find AltTabSettings DWORD. Set its Value Data to 1.
5. Disable / enable your hotkeys
User Configuration / Administrative Templates / Windows Components / File Explorer

In the right pane, double click on Turn off Windows Key hotkeys. Select Enabled.
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