Not able to receive Slack notifications for oncall reminders

[nkijain]

@minhaz1 could you help here as I believe from #394 post that you can provide some guidance here too! Thank you.

Hi, I am able to setup the oncall roster and schedule for my team (screenshot attached).

I have also made following changes to ./configs/config.yaml

notifier:
    skipsend: False
notifications:
  default_modes:
    - "slack"
messengers:
- type: slack
     webhook: "https://hooks.slack.com/triggers/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"

However, I am still NOT able to receive notifications.
My Database enteries looks like this -

mysql> select * from notification_setting;
+----+---------+---------+---------+---------+-------------+------------------+
| id | user_id | team_id | mode_id | type_id | time_before | only_if_involved |
+----+---------+---------+---------+---------+-------------+------------------+
|  1 |       1 |       1 |       4 |       1 |       86400 |                1 |
|  2 |       1 |       1 |       4 |       1 |      604800 |                1 |
|  3 |       2 |       1 |       4 |       1 |       86400 |                1 |
|  4 |       2 |       1 |       4 |       1 |      604800 |                1 |
|  7 |       4 |       1 |       4 |       1 |       86400 |                1 |
|  8 |       4 |       1 |       4 |       1 |      604800 |                1 |
|  9 |       5 |       1 |       4 |       1 |       86400 |                1 |
| 10 |       5 |       1 |       4 |       1 |      604800 |                1 |
| 11 |       6 |       1 |       4 |       1 |       86400 |                1 |
| 12 |       6 |       1 |       4 |       1 |      604800 |                1 |
| 13 |       7 |       1 |       4 |       1 |       86400 |                1 |
| 14 |       7 |       1 |       4 |       1 |      604800 |                1 |
| 15 |       8 |       1 |       4 |       1 |       86400 |                1 |
| 16 |       8 |       1 |       4 |       1 |      604800 |                1 |
| 17 |       9 |       1 |       4 |       1 |       86400 |                1 |
| 18 |       9 |       1 |       4 |       1 |      604800 |                1 |
+----+---------+---------+---------+---------+-------------+------------------+

mysql> select * from event;
+----+---------+---------+-------------+---------+---------+------------+------------+------+
| id | team_id | role_id | schedule_id | link_id | user_id | start      | end        | note |
+----+---------+---------+-------------+---------+---------+------------+------------+------+
|  1 |       1 |       1 |           1 | NULL    |       7 | 1693794600 | 1694795400 |      |
|  2 |       1 |       2 |           1 | NULL    |       9 | 1693794600 | 1694795400 |      |
| 31 |       1 |       1 |           7 | NULL    |       9 | 1695004200 | 1696213800 | NULL |
| 32 |       1 |       1 |           7 | NULL    |       6 | 1696213800 | 1697423400 | NULL |
| 33 |       1 |       1 |           7 | NULL    |       5 | 1697423400 | 1698633000 | NULL |
| 34 |       1 |       1 |           7 | NULL    |       8 | 1698633000 | 1699842600 | NULL |
| 35 |       1 |       1 |           7 | NULL    |       3 | 1699842600 | 1701052200 | NULL |
| 36 |       1 |       1 |           7 | NULL    |       7 | 1701052200 | 1702261800 | NULL |
| 37 |       1 |       1 |           7 | NULL    |       9 | 1702261800 | 1703471400 | NULL |
| 38 |       1 |       2 |           8 | NULL    |       6 | 1695004200 | 1696213800 | NULL |
| 39 |       1 |       2 |           8 | NULL    |       5 | 1696213800 | 1697423400 | NULL |
| 40 |       1 |       2 |           8 | NULL    |       8 | 1697423400 | 1698633000 | NULL |
| 41 |       1 |       2 |           8 | NULL    |       3 | 1698633000 | 1699842600 | NULL |
| 42 |       1 |       2 |           8 | NULL    |       7 | 1699842600 | 1701052200 | NULL |
| 43 |       1 |       2 |           8 | NULL    |       9 | 1701052200 | 1702261800 | NULL |
| 44 |       1 |       2 |           8 | NULL    |       6 | 1702261800 | 1703471400 | NULL |
+----+---------+---------+-------------+---------+---------+------------+------------+------+