At this time the newer landing pages only allow for one list assignment.
To confirm, the issue is also occurring on all other networks, other devices, other browsers, and in Incognito / Private browsing you've tried on your end? Clearing your cache, disabling browser extensions, and safelisting our domains in any security programs, VPNs, or pop-up/ad-blockers you me be running is also resulting in the landing page never loading?
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