I too encountered the issue with getOfferings not working on Android. It was baffling because the revenuecat configuration (offering > product > entitlement)  was correct, and standalone api calls worked ok. All iOS tests worked fine, yet in Android I got errors. 

"There is an issue with your configuration. Check the underlying error for more details."

and upon digging deeper into that message:

“None of the products registered in the revenuecat dashboard can be found in the google play store”
 

For me, the issue was that I was using the WRONG API KEY when initiating revenuecat in a given function. I was trying to be “too agnostic”. 
 

// I was feeding the iOS api key when initiating revcat, thinking it was a global API key. 
await Purchases.configure({ apiKey: revenueCatApiKey }); 

// Then of course the rest of code worked fine on iOS....
const offerings = await Purchases.getOfferings();


// But what I needed to do was initiate revenue cat with the platform specific API keys, found under Platforms > dIOS OR GOOGLE] > Public API Key

const revenueCatApiKey = Platform.OS === 'ios' ? PUBLIC_REVENUECAT_KEY_IOS : PUBLIC_REVENUECAT_KEY_ANDROID;


// With the correct API key imported for the platform, the agnostic code worked as planned... ie: 

// Init 
await Purchases.configure({ apiKey: revenueCatApiKey }); // set per platform

// Execute code...
const offerings = await Purchases.getOfferings();

So in summary if you are having issues with getOfferings on Android, make sure you’re initiating revenuecat’s Purchases.configure() with the correct Public API Key for the platform.