All questions regarding mapmaking for Heroes of Might and Magic 3: The Shadow of Death.

Mynameisoccupied, let's clarify the situation. You mentioned the game version, which is good. Now, please provide the map name and, if you can't attach it (you just need to pack it into a ZIP archive by opening your message for editing in Advanced Mode – see the button at the bottom), remember: is it a standard map (from the game) or did you download it from the Internet or some other source? Can you provide a link to another website where this map is available? Or is it your own?
I remember that someone already asked this question once here (wasn’t it you?), and no one answered it in 1.5 years.
Regarding the situation: as I understand it, there is no way to enable or disable individual artifacts in the map properties in "Armageddon's Blade" (or in "The Restoration of Erathia") - this feature appeared later. More precisely, if the map version is RoE, then this is true: all artifacts are allowed on the map. Maybe the map is corrupted and needs to be rewritten, or maybe it needs to be saved in the SoD editor as an SoD version map.
And the most radical option: find and install the "Complete Collection", because it includes "Armageddon's Blade" and everything else. And there is hope that there will be no such problem there.