This question was also sent through our ticketing system, so we’re handling it there, but for anyone else who’s running into this issue in general, check out these posts to see if they help you:
 

Edit: also double-check that when you’re uploading the credentials key to RevenueCat, that you’re copy-pasting the JSON exactly - don’t change any of the structure. See this step in our guide for more information: https://docs.revenuecat.com/docs/creating-play-service-credentials#2e-create-and-download-the-public-key