writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, errNoSuchUser), r.URL)
		return
	}

	listType := r.Form.Get("listType")
	if listType != "sts-only" && listType != "svcacc-only" && listType != "" {
		// default to both
		listType = ""
	}

	var serviceAccounts []auth.Credentials
	var stsKeys []auth.Credentials

	if listType == "" || listType == "sts-only" {
		stsKeys, err = globalIAMSys.ListSTSAccounts(ctx, targetAccount)