Disable Microsoft Account sign in prompts for Windows

1. Press Win + R and type regedit

2. Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

3. Right-click > New > DWORD (32-bit) Value

4. Name it: NoConnectedUser

5. Set value to: 3

Windows Pro or higher

1. Press Win + R and type gpedit.msc

2. Navigate to: Computer Configuration > Administrative Templates > Windows Components > Windows Signin

3. Find "Block Microsoft Account" policy

4. Set it to "Enabled"