@tan80: Please can you specify which app or feature in particular is not vibrating?
For incoming calls, please head to the Phone app > Tap the 3 dots in the top right > Settings > Call alerts and ringtone > Ringtone and keypad tones > Vibrate while ringing, and toggle this option on. Now, head to Settings > Sounds and vibration > Call vibration pattern (select any option except 'Silent') > Notification vibration pattern (select any option except 'Silent').
For specific apps, head to Settings > Apps > Select the relevant app > Notifications, and make sure that 'Vibrate' is toggled on .
If the issue persists, head to the Samsung Members app > Press and hold on the app icon > Diagnostics > Vibration > Vibrate. Does the phone vibrate during this test?