Well, solved it myself :P
Somehow the jsreport template was messed up. I made another template by copy-paste and got a new shortid, that worked. It might be because copying templates between servers doesn't work.

I get a strange 404 error (not found). It works only sometimes
members call does not work, member call does using the same url and subroutine to call jsreport

My request ...

nav.factory("Report", function($http, $uibModal, global) {

var req = {
	method: 'POST',
    url: global.reportUrl + "/api/report",
    headers: {
        'Content-Type': 'application/json'
    },
	data : {
		"template" : {
			"shortid" : "x"
		},
		"data" : {
			"name" : global.club.name,
			"user" : global.user.id,
			"unit" : global.user.unit
		},
		"options": {
		    "debug": {
		      "logsToResponse": true,
		      "logsToResponseHeader": true
		    },
		    "reports": {
		      "save": true
		    },
		    "language": "da"
		  }
	}
}

function jsreportCall(req){
	$http(req)
    .then(response => {
		var uib = $uibModal.open({
			animation : true,
			templateUrl : "src/templates/print.html",
			controller : "printController",
			controlleras : "printController",
			resolve : {
				jsreport : response
			}
		});

		uib.result.then(function(returnValue) {
		});
    })
    .catch(errorpayload => {
        console.log(errorpayload.data);
    });
}

return {
	members : function(data) {
		req["data"]["template"]["shortid"] = "H1V8aL5I-";
		req["data"]["data"]["members"] = data;
		jsreportCall(req);
	},
	member : function(number) {
		req["data"]["template"]["shortid"] = "BykieHo8b";
		req["data"]["data"]["number"] = number;
		jsreportCall(req);
	}
};

});