Turn on automatic logon in Windows

To use Registry Editor to turn on automatic logon, follow these steps:

1. Select Start, and then select Run.

2. In the Open box, type Regedit.exe, and then press Enter.

3. Locate the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon subkey in the registry.

4. On the Edit menu, select New, and then point to String Value.

5. Type AutoAdminLogon, and then press Enter.

6. Double-click AutoAdminLogon.

7. In the Edit String dialog box, type 1 and then select OK.

8. Double-click the DefaultUserName entry, type your user name, and then select OK.

9. Double-click the DefaultPassword entry, type your password, and then select OK.

   If the DefaultPassword value doesn't exist, it must be added. To add the value, follow these steps:

   • On the Edit menu, select New, and then point to String Value.

   • Type DefaultPassword, and then press Enter.

   • Double-click DefaultPassword.

   • In the Edit String dialog, type your password and then select OK.
     
     Note: If no DefaultPassword string is specified, Windows automatically changes the value of the AutoAdminLogon key from 1 (true) to 0 (false), disabling the AutoAdminLogon feature.

10. Exit Registry Editor.

11. Restart your computer. You can now log on automatically.

Reference:
https://learn.microsoft.com/en-us/troubleshoot/windows-server/user-profiles-and-logon/turn-on-automatic-logon