I'm having trouble with an Approval Flow in SPO. My guest user has edit access to the site and can access the site. I successfully created the Approval Flow (Request sign-off) but when I enter the email address in the Approver dialog, I get no results back.
Any idea what may be wrong here? Oddly enough, before guest Approvals was released to GA, I _was_ able to enter the guest user's email address in the dialog box -- of course, they couldn't actually get to the approval at that point.