diff --git a/chrono/agendas/management/commands/sync_desks_timeperiod_exceptions_from_settings.py b/chrono/agendas/management/commands/sync_desks_timeperiod_exceptions_from_settings.py
index 0a4be18a..16183886 100644
--- a/chrono/agendas/management/commands/sync_desks_timeperiod_exceptions_from_settings.py
+++ b/chrono/agendas/management/commands/sync_desks_timeperiod_exceptions_from_settings.py
@@ -27,4 +27,4 @@ class Command(BaseCommand):
     def handle(self, **options):
         translation.activate(settings.LANGUAGE_CODE)
         for desk in Desk.objects.all():
-            desk.import_timeperiod_exceptions_from_settings()
+            desk.import_timeperiod_exceptions_from_settings(spool=False)
diff --git a/chrono/agendas/models.py b/chrono/agendas/models.py
index eb0a77e4..d3ef032a 100644
--- a/chrono/agendas/models.py
+++ b/chrono/agendas/models.py
@@ -1438,7 +1438,7 @@ class Desk(models.Model):
 
         return [OpeningHour(*time_range) for time_range in (openslots - exceptions)]
 
-    def import_timeperiod_exceptions_from_settings(self, enable=False):
+    def import_timeperiod_exceptions_from_settings(self, enable=False, spool=True):
         start_update = now()
         for slug, source_info in settings.EXCEPTIONS_SOURCES.items():
             label = source_info['label']
@@ -1451,7 +1451,7 @@ class Desk(models.Model):
             source.settings_label = _(label)
             source.save()
             if enable or source.enabled:  # if already enabled, update anyway
-                source.enable()
+                source.enable(spool=spool)
         TimePeriodExceptionSource.objects.filter(
             desk=self, settings_slug__isnull=False, last_update__lt=start_update
         ).delete()  # source was not in settings anymore
@@ -1540,7 +1540,26 @@ class TimePeriodExceptionSource(models.Model):
 
         return new_source
 
-    def enable(self):
+    def enable(self, spool=True):
+        self.enabled = True
+        self.save()
+
+        if spool and 'uwsgi' in sys.modules:
+            from chrono.utils.spooler import refresh_exceptions_from_settings
+
+            tenant = getattr(connection, 'tenant', None)
+            transaction.on_commit(
+                lambda: refresh_exceptions_from_settings.spool(
+                    source_id=str(self.pk), domain=getattr(tenant, 'domain_url', None)
+                )
+            )
+            return
+
+        self.refresh_from_settings()
+
+    def refresh_from_settings(self):
+        if not self.enabled:
+            return
         source_info = settings.EXCEPTIONS_SOURCES.get(self.settings_slug)
         if not source_info:
             return
@@ -1560,8 +1579,6 @@ class TimePeriodExceptionSource(models.Model):
                     start_datetime=start_datetime,
                     end_datetime=end_datetime,
                 )
-            self.enabled = True
-            self.save()
 
     def disable(self):
         self.timeperiodexception_set.all().delete()
diff --git a/chrono/manager/views.py b/chrono/manager/views.py
index b4c60924..31149d16 100644
--- a/chrono/manager/views.py
+++ b/chrono/manager/views.py
@@ -2492,7 +2492,9 @@ class TimePeriodExceptionSourceToggleView(ManagedDeskSubobjectMixin, DetailView)
                     continue
                 if was_enabled:
                     _source.enable()
-                    message = _('Exception source %(source)s has been enabled.')
+                    message = _(
+                        'Exception source %(source)s has been enabled. Exceptions will be imported in a few minutes.'
+                    )
                 else:
                     _source.disable()
                     message = _('Exception source %(source)s has been disabled.')
diff --git a/chrono/utils/spooler.py b/chrono/utils/spooler.py
index 39827baa..c0e6644d 100644
--- a/chrono/utils/spooler.py
+++ b/chrono/utils/spooler.py
@@ -43,3 +43,17 @@ def refresh_exception_source(args):
         source.refresh_timeperiod_exceptions_from_ics()
     except ICSError:
         pass
+
+
+@spool
+def refresh_exceptions_from_settings(args):
+    if args.get('domain'):
+        # multitenant installation
+        set_connection(args['domain'])
+
+    try:
+        source = TimePeriodExceptionSource.objects.get(pk=args['source_id'])
+    except TimePeriodExceptionSource.DoesNotExist:
+        return
+
+    source.refresh_from_settings()