Samsung betas are only made available to factory unlocked devices. If you wanted beta software you should of got a Pixel or a factory unlocked device.
You can unlock your Note 10. But you would have to call your carrier for more info.
The stable beta should be releasing in late November or early December. Guess you gotta wait until then. I have a factory unlocked device and I dont have the banner either.
You have to have unlocked firmware on your device and I'm almost certain that by now beta is closed. There are only so many slots available. Best bet is to go to sammobile and flash unlocked firmware on your device.