: If RCS is still "active" in Google Messages, Samsung Messages may fail to register because the service thinks the number is already in use elsewhere Proven Fixes and Workarounds 1. The "Cool Down" Method (Highest Success Rate)
Corrupted cache files can prevent the app from completing the registration handshake. Open > Apps . Find and tap Samsung Messages . Select Storage . Tap Clear Cache , then Clear Data . samsung messages chat registration failed fixed
Find (if installed) and clear its cache as well. Restart your phone . 2. Manually Deregister Your Number from Google RCS : If RCS is still "active" in Google