I am creating a Grafana SLO dashboard with alerting using Terraform.

I have also added the ability to send alerts to slack channel in case any alert fires as below

resource "grafana_slo" "my_slo" {
  count       = var.provision_slo ? 1 : 0
  name        = "My APIs"
  description = "Test"

  objectives {
    value  = 0.98
    window = "28d"
  }

  query {
    ratio {
      success_metric  =  " // query here exists"
      total_metric    = " // Query here exists"
      group_by_labels = ["env"]
    }
    type = "ratio"
  }

  label {
    key   = "team_name"
    value = "myTeam"
  }

  label {
    key   = "service_name"
    value = "myService"
  }

  destination_datasource {
    uid = "The UID is also present"
  }

  alerting {
    fastburn {
      annotation {
        key   = "name"
        value = "SLO Burn Rate Very High"
      }
      annotation {
        key   = "description"
        value = "Error budget is burning too fast"
      }
      label {
        key   = "grafana_slo_severity"
        value = "critical"
      }
      label {
        key   = "grafana_slo_window"
        value = "28d"
      }
    }

    slowburn {
      annotation {
        key   = "name"
        value = "SLO Burn Rate High"
      }
      annotation {
        key   = "description"
        value = "Error budget is burning too fast"
      }
      label {
        key   = "grafana_slo_severity"
        value = "warning"
      }
      label {
        key   = "grafana_slo_window"
        value = "28d"
      }
    }
  }
}

resource "grafana_contact_point" "slack_alerts" {
  name = "Slack Alerts"

  slack {
    url        = "Webhook url on my channel"
    recipient  = "#MY-alerts-channel"
    username   = "Grafana SLO Alerts"
    title      = "Alert: {{ range .Alerts }}{{ .Annotations.name }}{{ end }} for {{ .CommonLabels.service_name }}"
    text       = "{{ range .Alerts }}Severity: {{ .Labels.grafana_slo_severity }}nDescription: {{ .Annotations.description }}n{{ end }}"
  }
}

resource "grafana_notification_policy" "slo_policy" {
  group_by      = ["..."]
  contact_point = grafana_contact_point.slack_alerts.name

  group_wait      = "30s"
  group_interval  = "5m"
  repeat_interval = "4h"

  policy {
    matcher {
      label = "grafana_slo_severity"
      match = "="
      value = "critical"
    }
    contact_point = grafana_contact_point.slack_alerts.name
  }

  policy {
    matcher {
      label = "grafana_slo_severity"
      match = "="
      value = "warning"
    }
    contact_point = grafana_contact_point.slack_alerts.name
  }
}

The Dashboard gets generated perfectly and I can even see alerts in firing state. But they are not reaching the slack channel. I manually tested it from the contact point on the grafana UI and I received the message but nothing automatically.

Also,in the Notification policies tab on the UI, I can see :

I would appreciate any sort of help regarding this. What is going wrong here ?

Thanks!