I need to pass Authorization Token from API Manager (WSO2) to my Backend using policies like Header policy but it works for me only using cURL but not with UI.

curl -k -X 'GET'
'https://localhost:8243/test/1.0.0/support/get/55'
-H 'accept: /'
-H 'Authorization: Bearer gatewayToken
-H 'Authorization: Bearer BackendToken'

Using API policies in API Manager 4.1.0, you can add AddHeader policy and send any static headers to the backend services.