Microsoft Exchange - error al instalar exchange 2016

Buenas.
Instalando el exchange 2016 me da este error y no doy con ello, si alguien me pudiera hechar una mano se lo agradeceria, esta instalado sobre un server 2012 R2.

Error:
Se ha generado el siguiente error cuando se ejecutó "$error.Clear();
Install-ExchangeCertificate -WebSiteName "Exchange Back End" -services "IIS, POP, IMAP" -DomainController $RoleDomainController -InstallInTrustedRootCAIfSelfSigned $true
if ($RoleIsDatacenter -ne $true -And $RoleIsPartnerHosted -ne $true)
{
Install-AuthCertificate -DomainController $RoleDomainController
}
": "Microsoft.Exchange.Management.SystemConfigurationTasks.AddAccessRuleCryptographicException: No se pudo conceder acceso de servicio de red al certificado con huella digital 19573AD546FB20FDBAB0F8D617E180859D5A5507 porque se inició una excepción criptográfica. ---> System.Security.Cryptography.CryptographicException: Acceso denegado.

en Microsoft.Exchange.Security.Cryptography.X509Certificates.TlsCertificateInfo.CAPIAddAccessRule(X509Certificate2 certificate, AccessRule rule)
en Microsoft.Exchange.Security.Cryptography.X509Certificates.TlsCertificateInfo.AddAccessRule(X509Certificate2 certificate, AccessRule rule)
en Microsoft.Exchange.Management.SystemConfigurationTasks.ManageExchangeCertificate.EnableForServices(X509Certificate2 cert, AllowedServices services, String websiteName, Boolean requireSsl, ITopologyConfigurationSession dataSession, Server server, List`1 warningList, Boolean allowConfirmation, Boolean forceNetworkService)
--- Fin del seguimiento de la pila de la excepción interna ---
en Microsoft.Exchange.Configuration.Tasks.Task.ThrowError(Exception exception, ErrorCategory errorCategory, Object target, String helpUrl)
en Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target)
en Microsoft.Exchange.Management.SystemConfigurationTasks.InstallExchangeCertificate.EnableForServices(X509Certificate2 cert, AllowedServices services)
en Microsoft.Exchange.Management.SystemConfigurationTasks.InstallExchangeCertificate.InternalProcessRecord()
en Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__b()
en Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)".