Entitlement failing with quest native api

Entitlement is consistently failing for me on quest with the native C/NDK API:

I'm loading libovrplatformloader.so, then calling ovr_PlatformInitializeAndroid() with a valid appid, then ovr_Entitlement_GetIsViewerEntitled().

And I get the entitlement failure response after about 30 seconds.

Build is uploaded to the alpha channel, the logged in user is on the channel, and I can download the package from the store.  Fails both when installed with adb or from the store.

On latest (Platform SDK 1.36, Mobile SDK 1.23), but was also happening before upgrading both (platform 1.32, mobile 1.20).

Anything else I'm missing?