We are running Exchange 2013 CU15 Hybrid. We have recently installed Exchange 2016 CU4 in our environment. Created virtual directories same as Exchange 2013. Everything is working fine internally. OWA user can login to their mailboxes either on Exchange
2013 or 2016. But external OWA users whose mailboxes are on Exchange 2016 gettingbad request error. Users with mailboxes on Exchange 2013 can login fine.
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