Mimir managed alerting rule does not send notifications to contact point

Hi,

In Grafana 9.1.7 I have created a Mimir managed alerting rule as described here. The rule itself works, but when firing it does not send alerts to the webhook I have specified as default contact point. The default contact point works fine, when Grafana managed alerts I have set up fire it will send alerts to the webhook. Does the Mimir managed alerting need some additional configuration to make it work?

I’m experiencing the same issue here…
Grafana alerts from dashboards are working fine.
Managed alert from Mimir/Loki triggers but no notification send