> within a day people were complaining that I should turn of encryption because they had issues (from their own server probably), I never managed to do that Ob

> within a day people were complaining that I should turn of encryption because they had issues (from their own server probably), I never managed to do that Obviously you weren't able to do that - contrary to what OOP's article wrote, in Matrix it's not possible to deactivate E2EE for a room after it has ever been enabled. The closest thing to that you could do would probably be creating a new room without encryption and closing (tombstoning) the old room with a link to the new room.