How to get Header from the copy activity in ADF

We are trying to call ADO REST API to list groups. It's not working with paging, though. 

https://learn.microsoft.com/en-us/rest/api/azure/devops/graph/groups/list?view=azure-devops-rest-7.1&tabs=HTTP 

When i do the request using developer tools, i can use the continuationToken but unable to get the header reposne X-MS-ContinuationToken in paging rules.

Any advice on this is a great help.

Thanks,

Devendra