So I got this column validation: =[Sleep]>TODAY()
And user message "NO".
And it works, I cant put a date back in time, but the user message "NO" is just popping up for a millisecond, someone knows why?
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The column validation will not take effect unless you try to save a new item or save the changes made to an existing item.
I’ve run tests with “Require that this column contains information” set to “Yes” or “No”, in both classic and modern experience and I cannot reproduce this issue in my environment.
Maybe you can switch to another list and see if you will run into same issue.
See my test results below: