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When you are in the OSAPI Code...are you able to get the ExtProps from within the same app?
My suspicion is that the OAuth token you are using isn't linked to the same Add-On as your Tile/App that you are using to call this OSAPI Code. All ExtProps are isolated from other Add-ons, so if the Oauth Token you have is from another Add-On...it will in-deed be empty.
Checking from the App with some quick test code is the easiest way to ensure that the data is in fact being persisted.
Hope that helps.