[2021] Broken a20 and Shadow Of The Tomb Raider

Cross posting this from a similar thread:
https://steamcommunity.com/app/251570/discussions/0/3196989600448197979/?ctp=3#c3196989600457586623

Originally posted by Crater Creator: I don't know much about this, but I'm going to cross-post a workaround SylenThunder posted in another thread.

Originally posted by SylenThunder: Set Steam to Offline mode, and in the client folder edit platform.cfg. Change the second line from "crossplatform=EOS" to "crossplatform=". Do note that if you are on an existing save that you started with a20, it can reset your character data because it will no longer use the EOS ID for your player files. You will need to rename the files from your EOS ID to the Steam-64 ID.