Collaborative inbox using gsuite
- you have paid for Google Workspace (henceforth known as GW) (fka GSuite, fka Google Apps for your Domain) etc https://en.wikipedia.org/wiki/Google_Workspace
- you turned on google groups for business (go to admin panel for GW See https://support.google.com/a/answer/167096#zippy=%2Cturn-groups-for-business-on-or-off
- Create a Google Group and be its owner. I call this CustomerSupport group (henceforth known as CS).