diff --git a/addons/calendar/models/calendar_event.py b/addons/calendar/models/calendar_event.py
index 80988bb28d4..2ae5589c546 100644
--- a/addons/calendar/models/calendar_event.py
+++ b/addons/calendar/models/calendar_event.py
@@ -407,13 +407,12 @@ class Meeting(models.Model):
     def create(self, vals_list):
         # Prevent sending update notification when _inverse_dates is called
         self = self.with_context(is_calendar_event_new=True)
+        defaults = self.default_get(['activity_ids', 'res_model_id', 'res_id', 'user_id', 'res_model', 'partner_ids'])
 
         vals_list = [  # Else bug with quick_create when we are filter on an other user
-            dict(vals, user_id=self.env.user.id) if not 'user_id' in vals else vals
+            dict(vals, user_id=defaults.get('user_id', self.env.user.id)) if not 'user_id' in vals else vals
             for vals in vals_list
         ]
-
-        defaults = self.default_get(['activity_ids', 'res_model_id', 'res_id', 'user_id', 'res_model', 'partner_ids'])
         meeting_activity_type = self.env['mail.activity.type'].search([('category', '=', 'meeting')], limit=1)
         # get list of models ids and filter out None values directly
         model_ids = list(filter(None, {values.get('res_model_id', defaults.get('res_model_id')) for values in vals_list}))
diff --git a/addons/calendar/models/mail_activity.py b/addons/calendar/models/mail_activity.py
index cd921cda669..d3dff3f9f67 100644
--- a/addons/calendar/models/mail_activity.py
+++ b/addons/calendar/models/mail_activity.py
@@ -20,6 +20,8 @@ class MailActivity(models.Model):
             'default_name': self.summary or self.res_name,
             'default_description': self.note if not is_html_empty(self.note) else '',
             'default_activity_ids': [(6, 0, self.ids)],
+            'default_partner_ids': self.user_id.partner_id.ids,
+            'default_user_id': self.user_id.id,
         }
         return action
 
diff --git a/addons/calendar/tests/test_calendar.py b/addons/calendar/tests/test_calendar.py
index 8dfc6bfb89d..f3d81a42306 100644
--- a/addons/calendar/tests/test_calendar.py
+++ b/addons/calendar/tests/test_calendar.py
@@ -151,6 +151,32 @@ class TestCalendar(SavepointCaseWithUserDemo):
         self.assertEqual(test_event.res_id, test_record.id)
         self.assertEqual(len(test_record.activity_ids), 1)
 
+    def test_event_activity_user_sync(self):
+        # ensure phonecall activity type exists
+        activty_type = self.env['mail.activity.type'].create({
+            'name': 'Call',
+            'category': 'phonecall'
+        })
+        activity = self.env['mail.activity'].create({
+            'summary': 'Call with Demo',
+            'activity_type_id': activty_type.id,
+            'note': 'Schedule call with Admin',
+            'res_model_id': self.env['ir.model']._get_id('res.partner'),
+            'res_id': self.env['res.partner'].create({'name': 'Test Partner'}).id,
+            'user_id': self.user_demo.id,
+        })
+        action_context = activity.action_create_calendar_event().get('context', {})
+        event_from_activity = self.env['calendar.event'].with_context(action_context).create({
+            'start': '2022-07-27 14:30:00',
+            'stop': '2022-07-27 16:30:00',
+        })
+        # Check that assignation of the activity hasn't changed, and event is having
+        # correct values set in attendee and organizer related fields
+        self.assertEqual(activity.user_id, self.user_demo)
+        self.assertEqual(event_from_activity.partner_ids, activity.user_id.partner_id)
+        self.assertEqual(event_from_activity.attendee_ids.partner_id, activity.user_id.partner_id)
+        self.assertEqual(event_from_activity.user_id, activity.user_id)
+
     def test_event_allday(self):
         self.env.user.tz = 'Pacific/Honolulu'