Installed /e/OS to an S10 (beyond1lte). There are steps missing in the install guide.
1)TWRP and VBMETA images files must be zipped as a TAR file if using Odin to flash. Use 7-Zip to do this. the TWRP tar goes in the AP line and the VBMETA tar goes in the CP line. (I used Odin 3.14.1).
2) You need to download and flash as a zip using TWRP “multidisabler-samsung-3.5-corsicanu.zip” - I used version 3.5, there are others.
3) I was on the last version of Android12 with the latest security updates.
4) Don’t reboot TWRP before the sideload, it isn’t necessary.
5) Windows 11 didn’t like my device so ADB failed to pick it up. I used Ubuntu to sideload /e/OS.
It booted quite slowly to start, but is very zippy once up and running.
PLEASE DO NOT LOCK THE BOOTLOADER ONCE /e/OS IS INSTALLED. It won’t boot and you can and most likely will brick the device.
Thank yo to the developer. 
Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online services