Unable to link inboxes in newest build

Back to square one it seems. I am unable to link an outlook and a Gmail inbox in the win 10 mobile email app. Both accounts are working just fine other than that. Any idea why it isn't providing this option on this screen? I'm on a Lumia 929 (Icon).

https://1drv.ms/i/s!ApOFoeCDi5PgmNYjqPH_Myawyluexw

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