Site preview page shows no access

When I paste a link to my app, the preview it shows says there is no access allowed. I saw this post talking about the issue, but contrary to the advice therein, the screenshot has not updated for well over 24 hours. Please help! This is a highly suboptimal experience because I am trying to share my app publicly and widely.

For the record, in settings, I do have this app set to be available publicly, and that aspect is working correctly.

Welp, now it works, finally! I have no idea what changed.

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