PagerDuty Integration issue

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser): 2.11

Describe the issue:
Dear Blog Mates ,
I Tried to connect PagerDuty to our Opensearch
so i went into Management->Notification–> Create Channel
i called to the Channel PagerDuty and i follow the instruction from PagerDuty
so i Follow the Instructions and i filled all the parameters.
in the X-ROUTING-KEY i filled the integration key and i click on send test Message
and i got this Error

i Using API v2 Just for your Knowledge,
Did Someone Face with Problem like that ?
what should i do , i didn’t get any notifications to my Pager