Maybe the beta slots are full. Check your members app for any new update. Also make sure that your members app is up to date. If not then go to galaxy store and update your samsung members app. Then try again. Otherwise wait for stable update.
Beta closed. Please don't bothered about this now. You will be get One UI 7.0 stable version update may be in this quarter. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
