SWELOT
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Let's go through this step by step. Does the "Artifact Active Abilities" spell appear in your spellbook? If you have a Sphere, using this spell on the global map should open a menu where you can select the Sphere's element. Does the spell appear, but nothing happens when you click it? Or does it not appear at all? Are you playing on one of the standard maps or on a custom map?
Thank you for the prompt response. Unfortunately, I don't have the "Artifact Active Abilities" spell in my spellbook. All levels of the Guild of Mages were maxed out in all cities, and unfortunately, it didn't appear. I tried it on many maps, both created by me and downloaded from here and other sites, but the result is the same. I found many Spheres, but nothing happens. Other artifacts work normally. I tried different heroes from different factions, but to no avail ((( I don't know what I'm doing wrong.