Mail Grouping by Conversation issue

I have 'Group by Conversation' enabled but have a few consistent emails that I get that are not grouping (support tickets for work). These same emails do thread correctly in Gmail. Any advice on how to resolve this? It's driving me nuts!

MacBook Air, macOS High Sierra (10.13.3)

Posted on Apr 5, 2018 8:46 PM

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Mail Grouping by Conversation issue

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