If you win 10 matches in a row against 80+ OVR Superstars, you should be guaranteed a title match. It's possible that you might already have the title, but wouldn't know since there are no Championship entrances. To double check it, you can look at their stats and see if their Days Held is increasing.

Our team is currently investigating an issue where the title match is not starting even if you have met the requirements mentioned above.