Lock screen password

[jo44jo]

When I leave my desktop, I usually do a Winkey+L to lock the screen. When I return I expect to get a password prompt. Sometimes I do and sometimes I don't.

This has been going on since I first put up Win10. I am now at 64 bit v1903.

I have tried messing with and resetting all the options I can find related to password prompt and power saving modes w/o success.