iCloud email won't download to Outlook

I just got Outlook 2016 on my desktop (beta) and added my other email accounts. My iCloud .mac address shows on the list of accounts under preferences, with the green radio button indicating 'all good', but there is no corresponding email box or emails showing. I could swear they were there earlier in the week....

I am running the latest of everything on a late 2013 13" rMBP.