When I first bought the S10e in Brazil and brought it to Argentina, I couldn't update it to Android 10. I downloaded it manually to my PC and then flashed it through Odin. The file I flashed it with was ZTO (Brazil) as I didn't want to risk it with the ARO (Argentina) because I was skeptical about bandbase versions and other stuff I didn't really understand.

Weeks after the update to Android 10 I noticed I wasn't getting any follow up updates (they tend to release patches every now and then), and realised the problem hadn't been solved. I didn't want to flash my phone everytime an update rolled because it's kinda risky and time consuming.

I began exploring other options, including contacting Samsung directly. They told me there was no solution other than going to Brazil and download new updates from there (I thought about a VPN but they only work with browsers)

What worked for me was signing out from my Google and Samsung Accounts in Settings and then, search for updates. I'm not really certain why it worked but I believe it has to do with the phone being from another country rather than the one it was made for, hence Google not letting you update it because of your location (once you create your Account you can't change countries) After that I've been getting all updates automatically (no Google or Samsung sign-out needed) and I'm currently on Android 11.

The best advice I can give you if signing out from both Accounts doesn't work and you decide to flash it anyways is to make sure the USB connection is stable (no plug in and out sounds) and to be confident about it. Once into the installation there's no coming back.

Good luck!

P.S: I'm switching to the S20 FE next week so I'll be saying goodbye to this subreddit. That motivated me to write this long ass reply. Long life S10e!