Trying to send deployment information on jira using powershell script from jenkins

[Pranav Lonsane]

Trying to send deployment information on jira using powershell script using api docuentation given by atlassian.
https://developer.atlassian.com/cloud/jira/software/rest/api-group-deployments/#api-rest-deployments-0-1-bulk-post
Getting below error

"rejectedDeployments":  [
                                {
                                    "key":  {
                                                "deploymentSequenceNumber":  51
                                            },
                                    "errors":  [
                                                   {
                                                       "message":  "Invalid JSON: \u0027associations\u0027 is invalid. Must be of type Array."
                                                   }
                                               ]
                                }
                            ]

Any inputs on this would be apprciated. 

[Mark Rekveld - Marvelution]

Cross referencing https://community.atlassian.com/t5/Jira-Software-questions/How-to-integrate-Jenkins-with-Jira/qaq-p/1650139 as we are also discussing this issue there.