Google workspaces requires you to attach a non-workspaces-related account. Unless they both go down, you can still contact them. Worst case, I believe Workspaces requires a phone number now -- at least Google can't wipe that!

haven't had to deal with it, but I would assume it works since you can call them. you don't have to be logged in to request support. https://support.google.com/googleone/answer/9177339