Hi @john.mari,
Please verify the below mentioned format.
"{""itemData"": {""Name"": ""Value1"",""Priority"": ""Value2"",""SpecificContent"": {""Data"": ""[{\""Key3\"":\""Test\"",\""Key4\"":\""TES8\"",\""Key5\"":\""Test\"",\""Key6\"":\""1234Street\""}]""}}}"
Try this in the “Body” parameter of “HttpRequest” activity.
Thanks