public List<PSADCredential> GetAppCredentials(string appObjectId)
{
List<PSADCredential> CredentialList = new List<PSADCredential>();
var keyCredsList = GetAppKeyCredentials(appObjectId);
CredentialList.AddRange(keyCredsList.Select(kc => kc.ToPSADCredential()));
var passwordCredsList = GetAppPasswordCredentials(appObjectId);
CredentialList.AddRange(passwordCredsList.Select(pc => pc.ToPSADCredential()));
return CredentialList;
}