diff --git a/atst/domain/environment_roles.py b/atst/domain/environment_roles.py
index 366b61b2..dab6d8b8 100644
--- a/atst/domain/environment_roles.py
+++ b/atst/domain/environment_roles.py
@@ -7,7 +7,7 @@ from atst.models import EnvironmentRole
 class EnvironmentRoles(object):
     @classmethod
     def create(cls, user, environment, role):
-        if environment.application.has_member(user):
+        if environment.application.has_member(user.id):
             env_role = EnvironmentRole(user=user, environment=environment, role=role)
             if not user.cloud_id:
                 user.cloud_id = app.csp.cloud.create_user(user)
diff --git a/atst/domain/environments.py b/atst/domain/environments.py
index f604808f..76873a60 100644
--- a/atst/domain/environments.py
+++ b/atst/domain/environments.py
@@ -68,7 +68,7 @@ class Environments(object):
     def update_env_role(cls, environment, user, new_role):
         updated = False
 
-        if environment.application.has_member(user):
+        if environment.application.has_member(user.id):
             if new_role is None:
                 updated = EnvironmentRoles.delete(user.id, environment.id)
             else:
diff --git a/atst/models/application.py b/atst/models/application.py
index 43c667c3..95c03a43 100644
--- a/atst/models/application.py
+++ b/atst/models/application.py
@@ -9,7 +9,6 @@ from atst.models.application_role import (
     ApplicationRole,
     Status as ApplicationRoleStatuses,
 )
-
 from atst.database import db
 
 
@@ -52,8 +51,9 @@ class Application(
     def displayname(self):
         return self.name
 
-    def has_member(self, user):
-        return user in self.users
+    def has_member(self, user_id):
+        user_ids = set(str(user.id) for user in self.users)
+        return str(user_id) in user_ids
 
     def __repr__(self):  # pragma: no cover
         return "<Application(name='{}', description='{}', portfolio='{}', id='{}')>".format(
diff --git a/atst/routes/applications/settings.py b/atst/routes/applications/settings.py
index 169af8c9..12194ecf 100644
--- a/atst/routes/applications/settings.py
+++ b/atst/routes/applications/settings.py
@@ -7,6 +7,8 @@ from atst.domain.applications import Applications
 from atst.forms.application import ApplicationForm
 from atst.forms.app_settings import EnvironmentRolesForm
 from atst.domain.authz.decorator import user_can_access_decorator as user_can
+from atst.domain.exceptions import UnauthorizedError
+
 from atst.models.permissions import Permissions
 from atst.utils.flash import formatted_flash as flash
 
diff --git a/tests/models/test_application.py b/tests/models/test_application.py
index ae73f4a6..b576eb18 100644
--- a/tests/models/test_application.py
+++ b/tests/models/test_application.py
@@ -45,10 +45,10 @@ def test_has_app_member():
     user = UserFactory.create()
     app = ApplicationFactory.create()
     ApplicationRoleFactory.create(user=user, application=app)
-    assert app.has_member(user)
+    assert app.has_member(user.id)
 
 
 def test_does_not_have_app_member():
     user = UserFactory.create()
     app = ApplicationFactory.create()
-    assert not app.has_member(user)
+    assert not app.has_member(user.id)