diff --git a/superset/reports/notifications/slack.py b/superset/reports/notifications/slack.py
index 41ccad392..91470c5b0 100644
--- a/superset/reports/notifications/slack.py
+++ b/superset/reports/notifications/slack.py
@@ -192,10 +192,14 @@ Error: %(text)s
             SlackRequestError,
             SlackClientConfigurationError,
         ) as ex:
-            raise NotificationParamException from ex
+            raise NotificationParamException(str(ex)) from ex
         except SlackObjectFormationError as ex:
-            raise NotificationMalformedException from ex
+            raise NotificationMalformedException(str(ex)) from ex
         except SlackTokenRotationError as ex:
-            raise NotificationAuthorizationException from ex
-        except (SlackClientNotConnectedError, SlackClientError, SlackApiError) as ex:
-            raise NotificationUnprocessableException from ex
+            raise NotificationAuthorizationException(str(ex)) from ex
+        except (SlackClientNotConnectedError, SlackApiError) as ex:
+            raise NotificationUnprocessableException(str(ex)) from ex
+        except SlackClientError as ex:
+            # this is the base class for all slack client errors
+            # keep it last so that it doesn't interfere with @backoff
+            raise NotificationUnprocessableException(str(ex)) from ex
diff --git a/tests/integration_tests/reports/commands_tests.py b/tests/integration_tests/reports/commands_tests.py
index 49f5b73b9..eb606ffec 100644
--- a/tests/integration_tests/reports/commands_tests.py
+++ b/tests/integration_tests/reports/commands_tests.py
@@ -1208,8 +1208,21 @@ def test_slack_chart_report_schedule_with_errors(
             ).run()
 
         db.session.commit()
-        # Assert errors are being logged)
-        assert get_error_logs_query(create_report_slack_chart).count() == (idx + 1) * 2
+
+    # Assert errors are being logged
+
+    # Only one notification log is sent because it's in grace period
+    # for the rest of the reports
+    notification_logs_count = get_notification_error_sent_count(
+        create_report_slack_chart
+    )
+    error_logs = get_error_logs_query(create_report_slack_chart)
+
+    # check that we have two logs for each error
+    assert error_logs.count() == (len(slack_errors) + notification_logs_count) * 2
+
+    # check that each error has a message
+    assert len([log.error_message for log in error_logs]) == error_logs.count()
 
 
 @pytest.mark.usefixtures(