RHEL 9 beta (developer program) won't update repos. Something I need to do?

My system is listed as "Registered" under Settings -> About, and shows up as a used entitlement on my Red Hat account. But when I tried 'sudo dnf update' (and 'sudo yum update') even the base repos came back with a 403 error ( - Status code: 403 for https://cdn.redhat.com/content/beta/rhel9/9/x86_64/baseos/os/repodata/repomd.xml (IP: 173.222.100.251)
Error: Failed to download metadata for repo 'rhel-9-for-x86_64-baseos-beta-rpms': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried).

I tried the solutions listed on the discussion thread below without success, and checked the installation guide here: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/performing_a_standard_rhel_9_installation/index

I've listed a few subscription-manager outputs below. I feel like there must be something obvious that I'm just neglecting to do. Do let me know if I'm missing something.

The referenced thread: https://access.redhat.com/discussions/4656371

subscription-manager outputs:

$ sudo subscription-manager register
This system is already registered. Use --force to override

$ sudo subscription-manager status
+-------------------------------------------+
System Status Details
+-------------------------------------------+
Overall Status: Disabled
Content Access Mode is set to Simple Content Access. This host has access to content, regardless of subscription status.

System Purpose Status: Disabled

$ sudo subscription-manager release
Release not set

n.b. I tried variations on 'sudo subscription-manager version --set=9.0' (including swapping out '9.0' for '9.0beta' 'beta', etc) without success.