Can't get the token through postman! Help pls

Can’t get the token through postman!
I am authenticating via spring securitization.
Realm is created, client too, user too, role is there, secret_clientid too. But it still doesn’t work.

Why when testing a POST request to a server on port 8080 using the keycloak realm to get a token, an “unauthorized_client” error with the description “Invalid client or Invalid client credentials” occurs? I’ve made sure the client name and secret are correct, and I’ve also verified the password multiple times. Perhaps there are some new or specific rules I’m missing? Tried it without secret-client still doesn’t work

client_id=RestApi&client_secret=here’s my secret code&username=user&password=password&grant_type=password
Always the same error:
“unauthorized_client” with description “Invalid client or Invalid client credentials”

P.S. just learning keyCloak and security