TypeError: client.on is not a function, SDK won't initialize

I don't think anything changed on my end and in the past 24h, I'm getting "TypeError: client.on is not a function". It seems "client" returns "false" after initialization ("ZAFClient.init();")

I see the same error even if I start from scratch in a fresh folder: (from ZD quick start guide)

"npx @zendesk/zcli apps:new"

I tried all major browsers with the same results.

Is there a known issue? I don't see anything on the status page