I have configured as the following images but it seems that my Graylog server did not receive any messages (logs) from my Mikrotik and I also tried to create some messages for it
Note: Graylog server and Mikrotik with the same timezone.
Are you also writing in Graylog forum? As already said there, first check if messages can reach graylog server at all and if port 2514 is open on the server.