I'm interested because the bonus as a user who comes to get 300 spins with that first deposit is on the winz thread page.
Here is the answer for your question:
Looking at your name and your post history, you seems to be from the same country as me which is Indonesia, am I right?
The possible case is that you cant access it because your ISP block the access, I believe it is fine if you want to use VPN.
But if you are not from Indonesia, kindly check the terms related to the country restriction first.