3 Macro Warnings when launching Word 2010

Hello,

one employee running Acrobat DC 17 has the issue that she is always greeted with 3 macro warnings whenever she starts word. I traced them back to the PDFMaker Addin: When I disable it, the warnings disappear.

We have policy set up that only allows signed macros in all office products, which we will not change.

A different employee has the same setup with Acrobat DC 15 without any warnings. I already noticed that the addin code signature is no longer valid (ran out 2015). How can I fix this?