After the latest patch version 32627923
Matchmaking preferences in the option menu always revert to default. Changing the map selection, game mode etc. only gets saved temporarily. After a restart of the game the values are reset to default. Also the apply button in the option menu is grayed out and not working.
@regus2k Hey! Does this still happen if you set the Game Config file to read only. To do this make the changes and whilst the game is open go to:
Documents > My Games > Rainbow Six - SIege > (ID) > GameSettings.ini
Right click this file, go to properties then at the bottom select read only.
Once done restart the game and see if the changes are saved.
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