Have the same issue myself. Also reported it on the Beta test firmwares.
This issue also happened with the Google Pixel betas for Android 11. Thought Google/Samsung would have sorted it by now. ☹️
Have updated the previous list of countries and carriers that have now received Android 11.
Samsung have stated that it will be sometime in December but they do not specify dates for different countries, regions or carriers.
What would that tell you? They could announce a roll out for Asia beginning 8th December and roll out to say, Singapore, and then not release for India for 3 weeks. Can you imagine the furore that would cause?
Samsung would never release a platform upgrade such as this, all at the same time. A, "Staged", roll out is far more preferable and a lot safer. See... https://developerexperience.io/practices/staged-rollout#:~:text=A%20Staged%20Rollout%20is%20a,over%2....
Still more countries and carriers worldwide have now received Android 11.
With the roll-out of Three and O2 today, that completes the U.K. Android 11 update for the S20 flagships. 😁