diff --git a/passbook/core/models.py b/passbook/core/models.py
index 9372a1d98..b0380254a 100644
--- a/passbook/core/models.py
+++ b/passbook/core/models.py
@@ -2,20 +2,20 @@
 from datetime import timedelta
 from random import SystemRandom
 from time import sleep
-from typing import Optional, Any
+from typing import Any, Optional
 from uuid import uuid4
 
-from jinja2.exceptions import TemplateSyntaxError, UndefinedError
-from jinja2.nativetypes import NativeEnvironment
 from django.contrib.auth.models import AbstractUser
 from django.contrib.postgres.fields import JSONField
 from django.db import models
-from django.urls import reverse_lazy
 from django.http import HttpRequest
+from django.urls import reverse_lazy
 from django.utils.timezone import now
 from django.utils.translation import gettext_lazy as _
 from django_prometheus.models import ExportModelOperationsMixin
 from guardian.mixins import GuardianUserMixin
+from jinja2.exceptions import TemplateSyntaxError, UndefinedError
+from jinja2.nativetypes import NativeEnvironment
 from model_utils.managers import InheritanceManager
 from structlog import get_logger
 
diff --git a/passbook/core/templates/error/400.html b/passbook/core/templates/error/400.html
index b4f02ecfd..5cdbb3846 100644
--- a/passbook/core/templates/error/400.html
+++ b/passbook/core/templates/error/400.html
@@ -19,6 +19,9 @@
     <h1>{% trans 'Bad Request' %}</h1>
 </header>
 <form>
+    {% if message %}
+    <p>{% trans message %}</p>
+    {% endif %}
     {% if 'back' in request.GET %}
     <a href="{% back %}" class="btn btn-primary btn-block btn-lg">{% trans 'Back' %}</a>
     {% endif %}
diff --git a/passbook/lib/views.py b/passbook/lib/views.py
index 2ca27ce80..f7d25f425 100644
--- a/passbook/lib/views.py
+++ b/passbook/lib/views.py
@@ -1,5 +1,6 @@
 """passbook helper views"""
-
+from django.http import HttpRequest, HttpResponse
+from django.shortcuts import render
 from django.views.generic import CreateView
 from guardian.shortcuts import assign_perm
 
@@ -22,3 +23,8 @@ class CreateAssignPermView(CreateView):
             )
             assign_perm(full_permission, self.request.user, self.object)
         return response
+
+
+def bad_request_message(request: HttpRequest, message: str) -> HttpResponse:
+    """Return generic error page with message, with status code set to 400"""
+    return render(request, "error/400.html", {"message": message}, status=400)
diff --git a/passbook/providers/saml/migrations/0006_auto_20200217_2031.py b/passbook/providers/saml/migrations/0006_auto_20200217_2031.py
index 9e190405f..37d39a0e9 100644
--- a/passbook/providers/saml/migrations/0006_auto_20200217_2031.py
+++ b/passbook/providers/saml/migrations/0006_auto_20200217_2031.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.0.3 on 2020-02-17 20:31
 
 from django.db import migrations, models
+
 import passbook.providers.saml.utils.time