In Arma 3, I had commanded AI units via the numpad. E.g. I opened the "Move menu" with Numpad 1, and then selected with Numpad 1, for example, that the units should get back into formation. Or another example: I press numpad 8, the formation menu opens, and with the corresponding numpad key I select the formation. None of this works anymore: The action menu opens and I can also jump into the submenus, but the commands just mentioned will not be carried out. Strangely enough, however, some commands already work, such as specifying a target for the units, saluting or sitting down.
I completely reinstalled Arma 3, moved the Appdata folder and the Arma 3 profile folders to start over. I haven't loaded any mods.
The normal keys 1-0, on the other hand, work perfectly when opening the action menu and command, although they are not entered in the settings.