Diagnostics and usage data option disabled

O&O Software sent me a solution, it's very simple:

Jump into regedit

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\DataCollection

Delete the binary key "AllowTelemetry" (Right Side)

Fixes it :-)

If you don't find an "AllowTelemetry" key in harley_woop's registry address, you may find it at this registry folder address instead.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\DataCollection

My PC is Windows 10, Home Edition. The "Basic" option was selected, but the "Full" option was greyed out/unselectable. This is the process I used to select "Full".

1. Open Registry Editor with Administrator privileges
2. Copy the below address into the address bar. Press the Enter key.
3. Right-click on the AllowTelemetry DWORD > Modify
4. Change the hexadecimal number to "3" ("Full")
5. Exit Registry Editor
6. Restart the Settings App
7. Settings > Diagnostics and Feedback Settings
8. The "Full" setting should now be selected (even though greyed out). No restart should be required.

---

AllowTelemetry DWORD Possible Options

0 = Security (Enterprise and Education editions only)

1 = Basic

2 = Enhanced

3 = Full (Recommended)

Information Source: Microsoft Answers Forum

This can also be because you've disabled the service "Connected User Experiences and Telemetry".