Did you try the KOFF or the KOC? KOC is EOL, you need to use KOFF.
Btw. connect to kerio per browser > integration link below the login > dl the autoconfig script

AFAIK you need to start outlook - in some cases - at least once. Maybe thats the problem? Or maybe it wont work with office 64 bit? (if you use it).

KOFF is supported with Windows 10 and Outlook 2016....

[EDIT] You really have installed the real Outlook program and not some cloud/356 miniature version of it? (if that even exists)

I have recently installed KOFF on a dozen systems with no real problems that were not typing errors.

I follow the route of using the Integrate with Windows link on the bottom of the Webmail screen, then use the 2 links on the left side of the screen under Kerio Outlook Connector. First I run and install from the download link on the left and when that is complete I use the link on the right marked download auto-config tool. When run, the tool asks for the credentials of the user and then runs a script that sets up Outlook and finally begins Outlook. At this point it will display the user but ask again for the password. At that point the new Outlook profile is created and I have the user up and going save for customising those areas of Outlook that the user wants to see including attaching their other PST files.

I even use this method for users at home and they can get to the tools and be installed in a small amount of time.

Are you doing your installation this way or are you directly going into Control Panel and doing the setup manually? Both should work but this one has done the trick for me at my most recent client and we have been running (on 9.2.5 patch 3 I believe) with no particular issues. Now if 9.2.6 had only been written to the same quality as 9.2.5 we would happily go on to our next opportunity - but that is a different discussion that you are likely aware of as you chose 9.2.5.

Have I missed something important that makes your setup different?