Office 365; User can not log on; The user-id may be invalid

One of our students can not log on to Office 365. The message he receives (see pic) says something like this:

This does not work
The user-id may be invalid

The user has no strange characters in either his sam account name or e-mail.
Other users have no problems so far.
The user had no problems in the past weeks.
Naamloos.png
capellenAsked:
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James HodgeManaging DirectorCommented:
Hello,

Is this the message he receives when logging into Outlook Web Access?

James
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capellenAuthor Commented:
No James it is Office 365: https://login.microsoftonline.com or http://mail.office365.com
We use Federated Domains.
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James HodgeManaging DirectorCommented:
This is the Outlook Web Access feature of Office 365 (Exchange Online).

Are they able to access their account from a copy of Office (Outlook) or on a mobile device? Maybe the students do not access this way?

James
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capellenAuthor Commented:
The account can be accessed by using Outlook 2013 (tested it myself). The students never use Outlook however.
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James HodgeManaging DirectorCommented:
Couple of things to try then:

1) Resetting the user's Password and trying (after replication)
2) Test Office 365 AutoDiscover:
https://www.testexchangeconnectivity.com/

Please post back the results

James
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capellenAuthor Commented:
1) I have reset the password, replicated the DC's and synced with DirSync. Result remains the same

2) Do you mean Connectivitystests Microsoft Exchange Web Services (first bullet)?
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James HodgeManaging DirectorCommented:
Office 365 tab --> Microsoft Office Outlook Connectivity Tests --> Outlook Autodiscover
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capellenAuthor Commented:
Autodiscover test works. Strangely enough when I try to logon at home I am redirected to my own Hotmail account (using windows 8 and a Hotmail account so automatically logged on).
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James HodgeManaging DirectorCommented:
The Hotmail redirect must be because you are already logged in to Hotmail at home?

Does the Office 365 Web Access login failure replicate across multiple PC's in different locations?

James
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capellenAuthor Commented:
"Does the Office 365 Web Access login failure replicate across multiple PC's in different locations? "

Yes it does, just that single account so far.
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capellenAuthor Commented:
I solved it by changing the upn to a dummy (replicated the DC's and synced with DirSync) and back to what it's supposed to be (replicated the DC's and synced with DirSync).
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capellenAuthor Commented:
This was the correct solution for me. Do not yet know why it worked.
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