Set-CSUser identity not found

Hello, We try to configure a Microsoft Teams Room with Direct Routing*

Everything is working fine except when we want to provide the telephone number to the Meeting Room

Error Message : PS C:\WINDOWS\system32] Set-CsUser -Identity IpsilanMTR@tourinitiale.onmicrosoft.com -EnterpriseVoiceEnabled $true -OnPremLineURI tel:+33130162030 Objet de gestion introuvable pour l’identité « IpsilanMTR@tourinitiale.onmicrosoft.com ». + CategoryInfo : NotSpecified: (:) [Set-CsUser], ManagementException + FullyQualifiedErrorId : Microsoft.Rtc.Management.AD.ManagementException,Microsoft.Rtc.Management.AD.Cmdlets.SetO csUserCmdlet + PSComputerName : api.interfaces.records.teams.microsoft.com

Regards.