The 10C Mobile Invite Viewer is alive!
Head to: https://jeremywsherman.com/tencinvites/
After you log in, you get a list of all codes not yet redeemed, each linked straight to the auto-fill URL. Long-press and copy the URL to share with someone.
If you run out, use Admin to generate some more, then you can view them in this web app again.
/@larand @matigo