FHm you use organizations for your customers or seperated instances?
FHei @Alexei I think it is not possible to register the same user from an external idp twice on different organizations at the moment. when registerin we check if the user has already been linked somewhere
FI actually did not thought about till you asked the question. 
We might have to investigate into it. Problem is porbably that it would only work if you alway send an organization scope. otherwise we do not know which use you mean
We might have to investigate into it. Problem is porbably that it would only work if you alway send an organization scope. otherwise we do not know which use you mean