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I don't see any official announcement of this on their Twitter feed so its likely an in-progress change.

I'm in the same boat. Maybe it's a phased rollout?

I'm in Canada, maybe this is US-only at first?

Tried it in the US. Still tells me I need a Max plan.

Update: It works now.

/login didn't help?

No. It gives two options: Max or pay-as-you-go. I selected Max and it told me I needed to upgrade from Pro.

Works now.