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For the past month and a half or so Outlook 2016 will continually prompt for username and password to a point where I have to close it and re open it. It also will not sync unless I close and reopen it. This is getting really annoying. First level support was all but useless. I'm a network and email tech and have done pretty much everything on my end. including:
1. Deleting and recreating my profile, my .ost file, and any other file involved.
2. Changed my password about 5 times, this will work for about an hour then it starts doing the same thing though it still doesn't sync.
3. Verified all my settings and tested.
Basically first level support said they don't support 3rd party products like Outlook and to use the webmail. This is not acceptable. I read a similar post a couple of weeks ago where moving their account to a different email server solved the trick.
This started happening to me (and others in family) a couple days ago. On an iPhone or iPad the message is "Cannot Get Mail. The user name or password for "Cox" is incorrect. OK or Settings"
On Outlook 2016 it's "enter your user name and password for the following server". Server is pop.cox.net and settings are just like Cox has in their email user guide. I just ignore the message or enter OK and then a couple minutes later it usually works, until later that day or next day.
There are similar guides for iPhone and iPad.
P.S. It is NOT a new problem.