Hello,


we have in place a hybrid configuration Exchange 2013 / Office 365

so we are migrating over time mailboxes in Office 365.

Since today, we can no longer initiate migration batch exchange ECP since 2013 (always possible since Office 365)

When selecting the user to migrate and you click on "to Exchange Online" Login windows to Office 365 appears

and when you click on "connect at office 365" here is what appears:

Client Information
------------------
User Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.3; WOW64; Trident/7.0; .NET4.0E; .NET4.0C)
CPU Class: x86
Platform: Win32
System Language: fr-FR
User Language: fr-FR
CookieEnabled: true
-----------------
Exception Details
-----------------
Date: Tue Jun 30 12:16:29 UTC+0200 2015
Message: Unable to set the property "mkt" of a null reference or undefined
Url: https://mail.domain.com/ecp/15.0.1076.9/scripts/navigation.js
Line: 1

Call Stack
----------

Dump Event
----------
 errorMessage =Unable to set the property "mkt" of a null reference or undefined
 errorUrl = https://mail.domain.com/ecp/15.0.1076.9/scripts/navigation.js
 errorLine = 1
 errorCharacter = 12348
 errorCode = 0
 actionURL =
 altKey = false
 altLeft = false
 behaviorCookie = 0
 behaviorPart = 0
 bookmarks = null
 boundElements = [object HTMLCollection]
 button = 0
 buttonID = 0
 cancelBubble = false
 clientX = 520
 clientY = 335
 contentOverflow = false
 ctrlKey = false
 ctrlLeft = false
 data =
 dataFld =
 dataTransfer = null
 fromElement = null
 keyCode = 0
 nextPage =
 offsetX = 0
 offsetY = 0
 origin =
 propertyName =
 qualifier =
 reason = 0
 recordset = null
 repeat = false
 returnValue = true
 screenX = 520
 screenY = 390
 shiftKey = false
 shiftLeft = false
 source = null
 srcElement = null
 srcFilter = null
 srcUrn =
 toElement = null
 type = error
 url =
 wheelDelta = 0
 x = 0
 y = 0
 getAttribute =
function getAttribute() {
    [native code]
}

 removeAttribute =
function removeAttribute() {
    [native code]
}

 setAttribute =
function setAttribute() {
    [native code]
}

Detailed Call Stack
-------------------

What can we do?

also thing we noticed, the Office link 365 no longer points to the Exchange admin online portal but to http://go.microsoft.com/fwlink/p/?LinkId=258351

Hi Jean,

Thank you for your question.

we suggest you post case to the following link:

https://social.technet.microsoft.com/Forums/msonline/en-US/home?forum=onlineservicesexchange

Best Regard,

Not sure if you found a workaround for this but this is what works for me when I get the same issue:

• Log into ECP
• Click on "hybrid"
• Click "modify"
• Click "sign in to Office 365", sign in* then go back to the "Enterprise" tab and try the migration again, this time you shouldn't get asked to sign in.

*sometimes this will ask me to sign in to on-premise Exchange here (weird).