You’ve joined the cnPilot Beta, but I don’t think you’ve joined the ePMP Beta (at least, not with the account that you’re currently using). There are separate programs for each product line.
See this post for more info:
…and then see this link for ePMP Beta release announcements (you won’t be able to access it until you’ve joined the ePMP Beta program):
https://community.cambiumnetworks.com/tags/c/products/epmp-beta/48/release-notes
This post lists most of the 4.6 improvements (note that the rc28 release was withdrawn but rc29 includes the same changes):
https://community.cambiumnetworks.com/t/epmp-beta-release-4-6-rc28-is-no-longer-available/73145