Office 365 Logon Enhancement – Username Capture
Published Aug 10, 2017
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Hi Songseajoon,
It will be the AD Server that you want your SAML IdP to use. If you have self-hosted AD and your F5's are in the same location (e.g. on-premise), then you'd generally be looking at using those AD servers.
You probably want to talk to your AD team if these concepts are unclear.