Thanks Glenn for your help.

I ran your script, and the membership is OK for the user.
Then I modified the script with the recommendations of Lonkero, and now I'm facing a problem with the error 1265 when trying to mount the differents shares.

 Code:
 1265 ERROR_DOWNGRADE_DETECTED The system detected a possible attempt to compromise security. Please ensure that you can contact the server that authenticated you.


I checked my Domain Controller Policy and verified that the following GPO is already set.

 Code:
1.Logon to a Windows Server 2008-based domain controller.
2.Click Start, Run, type gpmc.msc, and then click OK.
3.In the Group Policy Management console, expand Forest: DomainName, Controller, Domain Controllers, right-click Default Domain Controllers Policy, and then click Edit.
4.In the Group Policy Management Editor console, expand Computer Configuration, Policies, Administrative Templates, System, click Net Logon, and then double-click Allow cryptography algorithms compatible with Windows NT 4.0.


Any idea?

We're close to succeed (I hope) ........