Can't display Zoom dev tools from dev beta version of Zoom

I’m trying to use dev beta version of Zoom to develop a Zoom app.
I downloaded the latest version (6.2.1 (226)) from Zoom Apps Announcements channel, installed it and set “” equals to “true” in mac terminal. Then launched Zoom.

However, nothing happened to my Zoom client. I can’t see any app dev tools.
Then I repeated the above steps on my PC. It doesn’t work again.

I’ve also tried the development environment. But Zoom said the version already expired and gave me a 1006 error code.

The Zoom account I’m using was whitelisted 3 months ago. And I’ve also submitted another application to CenterCode yesterday. What else should I do?

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