Due to a shield glitch in Rainbow Six Siege, Ubisoft is now looking into fixes since the problem is now so severe that several aspects of the game are currently temporarily disabled. Operator Clash, deployable shields, and claymores will be disabled. The ammunition count will be set to zero. Ubisoft is currently working on fixes and will have an update on Tuesday, May 21st.
Rainbow Six Siege Operator Clash Temporarily Removed - GS News Update
Due to a severe shield glitch in Rainbow Six Siege, Ubisoft has temporarily disabled certain aspects of the game