Is it just me or is the Slack channel broken?! Did I miss a memo?
the bv slack tenant is still active, but the sign-up app that someone deployed (jono?) has clearly gone away or been suspended. if you’re not a member, best you can do is have someone already there invite you (probably jono again; you can sign up direct at badvoltage.slack.com/signup but only if you have a jonobacon.org email address 
).
Thanks
I’ve already got an account there so using badvoltage.slack.com I was eventually able to make it in.