You are trying to set up your Exchange Server account in Conditional Exchange Access to fetch device details and get the error message 'Unable to connect to Exchange - Verify entered credentials and pre-requisites'
You might get this error message, due to the following:
Verify whether the Server FQDN and user name are entered in the specified format.
Server Name : Enter the Fully Qualified Domain Name of the Server. Example: exchange.server.com
User Name : Enter the user name in the format <email@example.com>
In the system running Exchange Server, Open IIS Manager, select Sites from the left pane. Then select Default Website > PowerShell > Authentication. Enable 'Basic Authentication' option by selecting 'Enable' from the Actions menu in the right pane and click Apply.
Applies to: Device Management, Device Enrollment, Mailbox Access Management
Keywords: Conditional Exchange Access, Exchange Server not reachable, Exchange Server Admin