Preciso consumir uma API de terceiros que utiliza URL HTTPS, no postman, funciona normalmente, no Protheus retorna a mensagem "403 Forbidden", alguém tem alguma dica?

/*
oRestClient  := FWRest():New("https://apiempresa.com.br/")
cUrlPath := "ics-seguranca/v1/oauth2/tokenGerar"
403 Forbidden

oRestClient  := FWRest():New("https://apiempresa.com.br/ics-seguranca/")
cUrlPath := "v1/oauth2/tokenGerar"
403 Forbidden

oRestClient  := FWRest():New("https://apiempresa.com.br/ics-seguranca/v1/")
cUrlPath := "oauth2/tokenGerar"
403 Forbidden
*/

oRestClient  := FWRest():New("https://apiempresa.com.br/ics-seguranca/v1/oauth2/")
cUrlPath := "tokenGerar"
// 403 Forbidden

// https://apiempresa.com.br/ics-seguranca/v1/oauth2/tokenGerar

jLogin := JSonObject():New()
jLogin["grant_type"] := "password"  
jLogin["username"] := ::cCodUser //  
jLogin["password"] := ::cCodPasw // 

aadd(aHeadOut,'Content-Type: application/json' )
aadd(aHeadOut,'Cache-Control: no-cache')
aadd(aHeadOut,'Authorization: Basic SUNTOnRvdGFs')

cJson := jLogin:ToJson()

oRestClient:setPath(cUrlPost)
oRestClient:SetPostParams(EncodeUTF8(cJson)) 

If oRestClient:Post(aHeadOut)
    cJsonRet := oRestClient:GetResult()
EndIf        

cErro := oRestClient:GetLastError()