Hadith On Ijma
Ok so it’s mawqoof and Umar رضي الله عنه ‘s opinion. So we have to first make sure we’re not being anachronistic. What did ijma mean in his time? Were there ahlul ilm with the same hierarchy etc as there would be 200 years after him? Also it is mawqoof but we’d have to ask a hadith specialist about it’s authenticity. I’m any case it’s not the لن تجتمع أمتي على ضلالة hadith. It’s a completely different narration