There seems to be a lot written about this issue. Some say it's because the Outlook 2016 version came from Office 365. Others because they switched Outlook from Pop3 to IMAP, or the Access is Runtime version, or it's Access 2013 with Outlook 2016 etc. etc.
Maybe this won't help, but I'll throw it in anyway since it apparently was solved. - https://www.accessforums.net/showthread.php?t=59392
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.