Can I ask if you’ve tried...
Tap “Menu” > “Settings”
Tap “Block numbers”
Tap the “-“ button associated with the phone number/contact you want to unblock.
If no joy try removing and re adding the number.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "