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Exchange 2016 OWA Log on UPN format won't work

sf1elds asked
Last Modified: 2018-02-02
I'm trying to set my OWA login option to UPN format. However it seems not to work even though I've set it to that format in authentication. See attached.

I'm trying to use the following format | username@domain.com

Only this format works | domain\username

I've also restarted the IIS.
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