But obviously “closed” has another meaning as well or you probably wouldn’t have asked the question “how to trigger activation”?
My recommendation is to have a dedicated column for [Activated?]. Initially set to “N”, once activation has happened then set it to “Y”. You can also have the option to “de-activate” at any time, regardless of status or state.
Storage is cheap these days so having extra columns, even they don’t do much, is NOT a big deal.
Think of support as well as users usage of the app. If you ever need to be able to determine if “activation” actually happened or some other error occurred, you’ll have a column to tell you immediately.
If you try to use an already existing column that has another meaning (e.g. Status) then as soon as the state changes, you loose the information that “activation” happened or not.
Bottom line, I would suggest to never mix multiple meanings into a single column. It often creates headaches later.
I hope this makes sense!!