I am trying to install TWRP on Samsung S8
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Setting up interface...
Protocol initialisation successful.
Some devices may take up to 2 minutes to respond.
Please be patient!
Downloading device's PIT file...
PIT file download successful.
RECOVERY upload successful
ERROR: Failed to receive session end confirmation!
Releasing device interface...
On a smartphone
*Only official released binaries are allowed to be flashed*
How to fix?
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welcome to this forum
this is due to a samsung protect feature, well known by @aibd ( Know your hardware - Samsung )
please share a photo of your phone’s download mode screen
The links to the material you gave refer to the 10 series of devices.
What about S8?
As predicted by @piero your phone is showing Prenormal. This is a conditional lock. Perhaps the solutions for S10 devices jumped out at you because they are more recent additions.
You might have use your skill and judgement to see if you can see which of the mentioned locks could have been applied by Samsung in your case.
This Search results for 'prenormal order:latest' - /e/ community would link you to others who have faced or are facing the same issue.
I followed all the steps in the instructions, did not help.
What else to try?
You are correct that Prenormal is not covered in the instructions.
You have a locked bootloader. Anything I could add will be repetition. Please ask again referring to the research you already made.