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I'll also copy-and-paste from a previous comment in case it might be useful: If you're trying to enact Primogeniture for yourself (same rules apply to AI, which they often fail), make sure you’ve got the appropriate crown authority (high/absolute crown authority), prestige, powerful vassal approval, and have the actual Primogeniture innovation
Regarding the AI, that's to be expected; AI with default behaviour still struggle to adopt Primo, even if they have the innovation (bc of req'd crown authority, prestige, & powerful vassal approval)--using both the 'culture' and 'realms' options should help the AI bypass that (the former grants cultures the innovation, the latter changes the realm law)
🎄✨ Also, Merry Christmas & Happy New Year to anyone strolling by ! ✨🎄