As far as I now, that report does not exist at his time. The issue is that Canvas does not create an account for the invited user until they accept the invitation. Once the invitation is accepted (and, therefore, the account is created) you can find the user in the reports.
Here is one way to accomplish the goal:
1) keep track of the people to whom you are sending invitations.
2) periodically run a provisioning report for all users. (The most recently created users will be at the bottom.)
3) compare the list of sent invitations (step 1) to the provisioning report (step 2) to see who has accepted the invitation and has an account.
It's not a super-smooth solution, but it probably beats going course by course to see who has a pending invitation (unless you only have a course or 2 or 3 that you invite people to.)
Another option would be to bookmark the 'people' page for each course for which you are sending out invitations.
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