We have On-premises Exchange 2007/Domain controller installed and Outlook Anywhere is "Disabled"
For some testing, When I try to configure Exchange online account in our office, it is giving error attached.
I understand that it is about AUtodiscover or Outlook anywhere issue of on-premise exchange server.
But in my case, I'm trying to setup "Exchange Online" ,not my premises exchange.
After further test, I notice it is actually giving warning for other domains (my friend's server)as well for autodiscovery which is working
Any suggestion what could be causing this ?