Am not receiving Windows 11 beta update

Windows 11 hasn't yet hit the Beta Channel. It's in the Dev Channel right now. If you want Windows 11 Insider Program you'll have to go into Dev or at least try to go into Dev Channel. Dev gives you earlier access to builds that come before Beta, but can sometimes be buggy, glitchy, or can be unstable builds at times as the builds haven't yet hit Beta Channel. However unlike Beta once you're in Dev you can't exit the Insider Program or go back down to Beta Channel or the Release Preview Channel unless you do a Windows 10 clean install. You can go Release Preview to/or Beta and/or to Dev, but you can't go from Dev to Beta or Release Preview. Eventually Windows 11 will hit Beta, but at the time of this post it's still in Dev Channel builds. Here's more information about Dev vs Beta to help you decide which channel of Windows Insider Program might be best for you: https://docs.microsoft.com/en-us/windows-insider/flighting