This is usually because you have the TF2 console variable cl_disablehtmlmotd set to 1. In order to earn points on our servers, this variable needs to be set to 0.
Here is how to change the variable value:
- Open the console in TF2, here is a video tutorial that explains how to do that
- Type in cl_disablehtmlmotd 0
- You are done
Now you should receive points on our TF2 idle servers.