Shouldn't be doing it on a fairly new machine but just to be sure check the weep tube that attaches to the waterpump at about the 5 o'clock position. In this link it is the nipple sticking downward between the (2) part nos. 39 in the schematic. May have to take some plastics off to get a good look. https://www.partzilla.com/catalog/y...ine-rmax-2-yxe10wpamw-b4m41/crankcase-cover-1
There is a black rubber piece of tubing attached to it , about 10" long, (part no. 30). May have to use a mirror to see it very well, make sure it is not being pinched by the engine mounts, or anything else, while looking at it. If oil is leaking out of this black tube, verify to make absolutely sure that is where it is coming from because if it is then the seal on the oil side of the water pump is bad. This is a pretty big job to replace and if it is still under warranty definitely something you want a dealer to do. As long as you keep the oil tank filled to the correct level it won't hurt to run the machine, but it will continually get worse to the point that you will have a pretty good puddle of oil on the floor underneath the machine, after it sits for a few days. As I first mentioned, I would be surprised for this to be the problem on a fairly new machine.
As Budro2 already mentioned, check the air breather tube, part no. 51 in the same above schematic, can do from underneath without taking anything apart, using a flash light. While there also look for oil in the part no. 54 (semi-transparent plastic end cap). Remove the plastic end cap and if there is oil in it that is most likely your problem and it is leaking out one of the air breather joints. If there is oil in the plastic end cap it is from the engine oil tank being over filled.
Edit: I see where you already mentioned that you checked the plastic end cap on the breather tube.