diff --git a/lms/djangoapps/mobile_api/course_info/views.py b/lms/djangoapps/mobile_api/course_info/views.py
index cb474a5fd754..5c29dc1b5d58 100644
--- a/lms/djangoapps/mobile_api/course_info/views.py
+++ b/lms/djangoapps/mobile_api/course_info/views.py
@@ -132,6 +132,7 @@ def post(self, request, *args, **kwargs):
         course_key = request.data.get('course_key')
 
         if not user_id or not course_key:
+            log.error('User id and course key are required. %s %s', user_id, course_key)
             return Response(
                 'User id and course key are required',
                 status=status.HTTP_400_BAD_REQUEST,
@@ -141,6 +142,7 @@ def post(self, request, *args, **kwargs):
             user_id = int(user_id)
             user = User.objects.get(id=user_id)
         except User.DoesNotExist:
+            log.error('Provided user id does not correspond to an existing user %s', user_id)
             return Response(
                 'Provided user id does not correspond to an existing user',
                 status=status.HTTP_400_BAD_REQUEST,
@@ -149,6 +151,7 @@ def post(self, request, *args, **kwargs):
         try:
             course_key = CourseKey.from_string(course_key)
         except InvalidKeyError:
+            log.error('Provided course key is not valid %s', course_key)
             return Response(
                 'Provided course key is not valid',
                 status=status.HTTP_400_BAD_REQUEST,
diff --git a/lms/djangoapps/mobile_api/users/views.py b/lms/djangoapps/mobile_api/users/views.py
index eca113a88465..45a3e61bb5c5 100644
--- a/lms/djangoapps/mobile_api/users/views.py
+++ b/lms/djangoapps/mobile_api/users/views.py
@@ -3,6 +3,8 @@
 """
 
 
+import logging
+
 from completion.exceptions import UnavailableCompletionData
 from completion.utilities import get_key_to_last_completed_block
 from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imported-auth-user
@@ -37,6 +39,8 @@
 from ..decorators import mobile_course_access, mobile_view
 from .serializers import CourseEnrollmentSerializer, CourseEnrollmentSerializerv05, UserSerializer
 
+log = logging.getLogger(__name__)
+
 
 @mobile_view(is_user=True)
 class UserDetail(generics.RetrieveAPIView):
@@ -178,6 +182,7 @@ def _update_last_visited_module_id(self, request, course, module_key, modificati
         try:
             descriptor = modulestore().get_item(module_key)
         except ItemNotFoundError:
+            log.error(f"{errors.ERROR_INVALID_MODULE_ID} %s", module_key)
             return Response(errors.ERROR_INVALID_MODULE_ID, status=400)
         block = get_block_for_descriptor(
             request.user, request, descriptor, field_data_cache, course.id, course=course
@@ -228,12 +233,14 @@ def patch(self, request, course, *args, **kwargs):  # lint-amnesty, pylint: disa
         if modification_date_string:
             modification_date = dateparse.parse_datetime(modification_date_string)
             if not modification_date or not modification_date.tzinfo:
+                log.error(f"{errors.ERROR_INVALID_MODIFICATION_DATE} %s", modification_date_string)
                 return Response(errors.ERROR_INVALID_MODIFICATION_DATE, status=400)
 
         if module_id:
             try:
                 module_key = UsageKey.from_string(module_id)
             except InvalidKeyError:
+                log.error(f"{errors.ERROR_INVALID_MODULE_ID} %s", module_id)
                 return Response(errors.ERROR_INVALID_MODULE_ID, status=400)
 
             return self._update_last_visited_module_id(request, course, module_key, modification_date)