Outlook auto-send/receive unchecking itself

Newly installed Office 365/2016.

On my home computer, I have an exchange account (from work) and a personal POP account.

In the exchange account, when I check the "schedule an automatic ..." then do a send/receive (or restart outlook), the checkbox becomes unchecked.  The send/receive schedule is set to 10 minutes.

I do not have cached exchange mode selected.

The POP account does not exhibit this problem.

I had same problem with Outlook 365/2013 at home, but do not have this problem on my work machine (Outlook 2013).

Ideas?

thanks

Kevin