Unable to Configure Exchange 2016 Source Connection


I am trying to configure source migration connection. Created role:

New-RoleGroup -Name MigrationImpersonation -Roles ApplicationImpersonation -Members migAdmin@example.com

But still both autodiscover or without autodiscover it is not working. What I am missing. With autodiscover, i get this error

  • Autodiscovery Validation
    • Failed to validate using Autodiscover.
  • Item Retrieval Test
    • Invalid Mailbox (Unable to retrieve folders) : Could not locate mailbox using Autodiscover

Without autodiscover, by typing server URL, i get error with no explanation and just X.