Are you using the Body parameter in Postman with raw selected and JSON as the type?

If not, try using the following curl command into your terminal:

curl --location 'http://localhost:8084/api/user/user' \
--header 'Content-Type: application/json' \
--data '{
    "name": "Santiago",
    "email": "yes",
    "number": "4",
    "password": "rftgybn",
    "date_of_birth": "2024-11-06T12:30:00Z",
    "location": "Medellin"
}'