Slack Invite not recieved

<%- if @topic_view.topic.tags.present? %>
<%= t 'js.tagging.tags' %>: <%- @topic_view.topic.tags.each do |t| %> <%= t %> <%- end %>
<% end %>

Hi, Is the slack channel signup still working, I tried to sign up twice and it says it sent an email, but didn’t. Maybe I’ve already used my email - but lost any credentials? Can anyone please help?