Someone also said the above doesn't work and tried this
setting > system > power & sleep > click on 'change slideshow settings' > click 'advanced slideshow setting' then disable the option that says 'when my PC is inactive, show lock screen .....
setting > system > power & sleep > click on 'change slideshow settings' > click 'advanced slideshow setting' then disable the option that says 'when my PC is inactive, show lock screen .....