troubleshooting Question

Exchange 2016 OWA Log on UPN format won't work

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sf1eldsFlag for Barbados asked on
ExchangeEmail Servers* OWA
15 Comments2 Solutions1098 ViewsLast Modified:
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 |

Only this format works | domain\username

I've also restarted the IIS.
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