Unfortunately you are right. It seems that Microsoft added new class with the same name in different namespace and our service is generated at the moment with just class names (not fully qualified). We will do our best to provide fix in our next update early next week.
The latest release solved this problem, I'm very grateful.
But I detected another problem.
When I add a datagrid i get this error:
'FilterMode' is an ambiguous reference between 'Microsoft.Graph.FilterMode' and 'Radzen.FilterMode'