I'm surprised your IT team let you re-activate DDE. Or maybe they haven't and that's why you get pop up messages? Either way, Microsoft found some security flaws with DDE so started locking it down massively starting December 2018 I believe. For certain DDE commands there is an option to suppress warnings so you'll need to check if your calls to see if they support that to suppress warnings. Another is to make sure it's in a trusted location and trusted files which reduces the error.
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