how can I activate a point on the map using the ID of a point?
I thought of something like "series.select(1234)" -> https://api.anychart.com/7.12.0/anychart.core.map.series.Marker#select
But for example this code doesn't select any point on my map:
var series = map.marker(data);
series.select(2359);
Any ideas?
It looks like you've passed the wrong arguments to the select() method. In this case you should pass the array of indexes of the point to select, like
series.select([0, 1, 4]);
Also, you can take a look at this working example: http://jsfiddle.net/anycharts/4sn65L52/