Forum Discussion
Shaun_Simmons
Feb 18, 2020Employee
By default, AD will look for / verify the UPN or SamAccountName.
It is hard to answer your question, due to other unknowns that could cause issues, even if you have APM correctly configured.
See the below configuration guide that may help.
-https://www.f5.com/pdf/deployment-guides/microsoft-exchange-2016-dg.pdf