UNSUPPORTED MESSAGE

Hi, I've been able to resolve the previous issue with the protobuf by moving to a websocket and JSON for the call I am making but when I use a trading accessToken for a ProtoOAGetAccountListByAccessTokenReq, I get:

{"payloadType":2142,"clientMsgId":"msg_id_1689760100695","payload":{"errorCode":"UNSUPPORTED_MESSAGE","description":"Trading account is not authorized"}}