Pagerduty Notification Error

I got the following error :
lvl=eror msg=“Failed to send notification to Pagerduty” logger=alerting.notifier.pagerduty error=“Post "https://events.pagerduty.com/v2/enqueue\”: context deadline exceeded (Client.Timeout exceeded while awaiting headers)" body=“MyContentString”

When I test from this Grafana server run
curl --request POST --data “MyContetString” it’s working .

I did note that “Integration Key” didn’t save in next testing.

I’m using grafana version 8.3.2
I’m using legacy alerting (this configuration in grafana.ini)

[alerting]
enabled = false
[unified_alerting]
enabled = false