EOL - Users being redirected to the incorrect OWA URL

After implementing an Exchange Hybrid configuration, it was noted that users were being redirected to the incorrect URL when connecting to OWA. Looking at the organisation relationship we can see that the TargetOwaUrl is configured with the incorrect domain name. 



[PS] C:\Windows\system32>get-OrganizationRelationship | FL


RunspaceId            : xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
DomainNames           : {xxxxxxxxxx.mail.onmicrosoft.com}
FreeBusyAccessEnabled : True
FreeBusyAccessLevel   : LimitedDetails
FreeBusyAccessScope   :
MailboxMoveEnabled    : True
MailboxMoveDirection  : None
DeliveryReportEnabled : True
MailTipsAccessEnabled : True
MailTipsAccessLevel   : All
MailTipsAccessScope   :
PhotosEnabled         : True
TargetApplicationUri  : outlook.com
TargetSharingEpr      :
TargetOwaURL          : http://outlook.com/owa/INCORRECTDOMAIN.COM
TargetAutodiscoverEpr : https://autodiscover-s.outlook.com/autodiscover/autodiscover.svc/WSSecurity
OrganizationContact   :
Enabled               : True
ArchiveAccessEnabled  : True
AdminDisplayName      :
ExchangeVersion       : 0.10 (14.0.100.0)
Name                  :
DistinguishedName     : CN=On-premises to O365 -
                        xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx -,CN=Federation,CN=MHC,CN=Microsoft
                        Exchange,CN=Services,CN=Configuration,DC=DOMAIN,DC=lOCAL
Identity              : On-premises to O365 - xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Guid                  : xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
ObjectCategory        : domain.local/Configuration/Schema/ms-Exch-Fed-Sharing-Relationship
ObjectClass           : {top, msExchFedSharingRelationship}
WhenChanged           : 07/02/2019 11:05:05
WhenCreated           : 07/02/2019 11:05:03
WhenChangedUTC        : 07/02/2019 11:05:05
WhenCreatedUTC        : 07/02/2019 11:05:03
OrganizationId        :
Id                    : On-premises to O365 - xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
OriginatingServer     : DC01.DOMAIN.local
IsValid               : True
ObjectState           : Unchanged


   
To resolve this we simply updated the TargetOwqUrl with the correct domain name:

Get-OrganizationRelationship | Set-OrganizationRelationship -TargetOWAUrl http://outlook.com/owa/CORRECTDOMAIN.COM


We then implemented a webmail CNAME for example, webmail.domain.com which redirects to mail.office365.com and informed the users to use this URL.

If users still continue to receive errors please ensure they have cleared their browser cache.

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