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Just streaming in a broswer won't stop it locking. Full screen probably would.
I'd install this https://docs.microsoft.com/en-us/windows/powertoys/ if you want to keep a Windows PC from locking.
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Mouse jiggler is also a handy app for this and doesn't require installation so can be used without needing admin rights.
I guess it would also keep your status as available in something like MS Teams but that's something i couldn't possibly comment on.
I wanted to stop my W10 screen locking while I was away from my desk, so I played an 8hr YouTube of a fire. Just come back and it was locked.
How come?
Does streaming a video not count or something? Should I have full screened it?