i have an S20 on snapdragon (only 1 physical sim card). And i can't use eSIM... simply there is no "sim card manager", i know where it should be, but there in none. As well search didn't help.
In internet i found that not only me have such problem.
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It's never going to get enabled in Samsung USA firmware. No point in waiting... This is a request from Samsung S10 and so on and is in their backlog for years.
Read somewhere about a person in similar situation and he updated the CSC of the phone. That way you can get the country specific firmware and eventually get the eSim/Sim card manager enabled.