error logging in to Office 365 Portal, error:8004789A

hi,

i have an error logging in to the Office 365 Portal for specific users...

her is the error:

i tried the following:

Make sure that the changes to the user’s UPN are synced to Office 365 through directory synchronization.
Direct the user to log off the computer and then log on again.
If steps 1 and 2 don't resolve the issue, follow these steps:
1. Open Registry Editor, and then locate the following subkey:
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
2. Right-click Lsa, click New, and then click DWORD Value.
3. Type LsaLookupCacheMaxSize, and then press ENTER to name the new value.
4. Right-click LsaLookupCacheMaxSize, and then click Modify.
5. In the Value data box, type 0, and then click OK.
6. Exit Registry Editor.

it didnt help so i tried also this:

Click Start, click All Programs, click Windows Azure Active Directory, and then click Windows Azure Active Directory Module for Windows PowerShell.
At the command prompt, type the following commands, and press Enter after each command:
1. ```
$cred = get-credential
```
  Note When you're prompted, enter your Office 365 administrator credentials.
2. ```
Connect-MSOLService –credential:$cred
```
3. ```
Set-MSOLADFSContext –Computer:<AD FS 2.0 ServerName>
```
  Note In this command, the placeholder <AD FS 2.0 Server Name> represents the Windows host name of the primary AD FS 2.0 server.
4. ```
Update-MSOLFederatedDomain –DomainName:<Federated Domain Name>
```
  or
```
Update-MSOLFederatedDomain –DomainName:<Federated Domain Name> –supportmultipledomains
```
  Notes
  
  Using the –supportmultipledomains switch is required when multiple top-level domains are federated by using the same AD FS 2.0 federation service.
  
  In these commands, the placeholder <Federated Domain Name> represents the name of the domain that is already federated with Office 365 for SSO.

also nothing happen

i have exchange 2010, hybrid configuration

i have multiple domains

some users are @school.org

other are @student.school.org

all users @school.org are working fine

all users @student.school.org arent working, got the error that i attached at the begining

please help!!!