Cannot open another mailbox in OWA

Recently, users are unable to open other authorized maiboxes in OWA, even, the administrator. The following error message opens when opening another users mailbox:


Request
Url: https://dotnetserver.turcich.com:443/owa/
User host address: 192.168.0.1
OWA version: 14.2.318.2

Exception
Exception type: System.ArgumentNullException
Exception message: Value cannot be null. Parameter name: organizationId

Call stack

Microsoft.Exchange.Data.Directory.ScopeSet.GetOrgWideDefaultScopeSet(OrganizationId organizationId, QueryFilter recipientReadFilter)
Microsoft.Exchange.Data.Directory.ADSessionSettings.FromOrganizationIdWithoutRbacScopesServiceOnly(OrganizationId scopingOrganizationId)
Microsoft.Exchange.Clients.Owa.Core.Utilities.CreateADRecipientSession(Boolean readOnly, ConsistencyMode consistencyMode, SmtpDomain smtpDomain)
Microsoft.Exchange.Clients.Owa.Core.OwaMiniRecipientIdentity.UpgradePartialIdentity()
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.PrepareRequestWithoutSession(OwaContext owaContext, UserContextCookie userContextCookie)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.AcquireAndPreprocessUserContext(OwaContext owaContext, HttpRequest request)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.InternalDispatchRequest(OwaContext owaContext)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DispatchRequest(OwaContext owaContext)
Microsoft.Exchange.Clients.Owa.Core.OwaRequestEventInspector.OnPostAuthorizeRequest(Object sender, EventArgs e)
System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


Thanks
John