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PayPalHereSDK.CardReaderManager.AvailableReaders Always Empty


PayPalHereSDK.CardReaderManager.AvailableReaders Always Empty

I'm following the PayPal Here SDK example app. We're building an android app and trying to integrate the audio jack card readers. 

I get to the point in the app where the isMagStripeReaderConnected() function in the PayPalHereSdkWrapper class is called. The swiper is plugged in, but PayPalHereSDK.CardReaderManager.AvailableReaders always returns an empty collection. This causes my app to go to the "audio reader connect layout" where the message "Please plug-in audio jack reader" is displayed.

Not sure what else to do. I've tried three different phones with no luck. The same thing happens on each.