On https://admin.fedoraproject.org/mirrormanager/ there is an entry for 32_Beta which takes you to https://admin.fedoraproject.org/mirrormanager/mirrors/Fedora/32_Beta, but it says "There are currently no active mirrors registered."
This is a bug (missing feature) in MirrorManager, it detects version and announces them publicly which it should not. I disabled the version. The mirrors for 32 beta can be seen by looking at 32.
Metadata Update from @adrian: - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)