Can't join slack channel from Udemy LFCS course

I received this error:

This link is no longer active

To join this workspace, you’ll need to ask the person who originally invited you for a new link.

Section 2: Essential Commands
5. Join Our Slack Channel

Hi @halsaedi,
Sorry for the inconvenience. I have highlighted to the concnered team.

We do have one joining link in our website. Please check.