Linking Incoming Email To Google Group to Slack Channel

Hi all, I have a Google Group - a shared email address (like support@_____) where members of the group all receive incoming emails to the support@ email address into their personal inboxes. I want all incoming support@ emails to automatically forward to a specific Slack channel. Is there a way to do that? Every time I try to set it up, the first step is to log into Gmail and I only see a way to log into my personal Gmail account. How do I connect Zapier to the Google Group account? When I try, I get an error message saying “Couldn’t find your account.” Thanks!