What's the extension id?

Assigning to asargent@ for investigation.

For the webstore lockdown, anytime we notice a new extension being added to a user's profile we send a request to a webstore API endpoint to ask if this is an extension id that's known to be in the store. When a developer publishes the first version of a new extension in the webstore, apparently there can be a slight propagation delay (on the order of a few minutes IIRC) between when it's available for installation and when the id becomes known to the API endpoint, so you can get the glitch of it being considered not in the webstore. 

I think I noticed this in the past and asked the webstore folks about it, and IIRC the answer was that it would be fairly difficult to fix. Since in practice this only affected developers who publish a new thing to the webstore and then immediately install it themselves, and goes away within a few minutes, it was deemed not worth the effort. 

Does the above match the circumstances where you saw this? Does the problem go away after 5 minutes or so?

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Archiving given the explanation in #2 and no further comment.  Feel free to reopen if there's any new information.