workaround is via registry on the client computers. (of course you may set this trough Group Policy)
In keys :
HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\AutoDiscover
and
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\x.0\Outlook\AutoDiscover
Note x.0 in the above registry path corresponds to the Outlook version (16.0 = Outlook 2016, 15.0 = Outlook 2013, 14.0 = Outlook 2010, 12.0 = Outlook 2007).
create the value :
ExcludeHttpsRootDomain
and set it to 1