eSIMs worked perfectly for 2 out of 3 phones for us in Japan last summer. My phone however did not get any service until day 8 of our two week trip when it just magically started working. I have no idea what happened to make it start working. I don’t think I was doing anything wrong because I was the person that got it installed correctly on the other two phones. Customer service never responded to me.
This was through Ubigi so I would try it again but have a backup plan in place. I ended up renting a mobile hotspot for myself.