Like oauth, the saml provider from django-allauth can be configured with more than once with different IdPs At the moment mailman3 does trigger a MultipleObjectsReturned exception in django_mailman3/templates/socialaccount/snippets/provider_list.html, at line 21 if more than one IdP is configured. See [socialaccount/adapter.py get_app throws MultipleObjectsReturned exception if more than one saml provider is configured #3779 ](https://github.com/pennersr/django-allauth/issues/3779)