Snaptube app only supports sign in with a Google Account. Firstly, you need to have a Google account, then login to Snaptube.
When you log in with Google, Snaptube app needs to grab your account information, which will take a few seconds. Please wait after clicking the login button. Don’t tap it too many times.
Login will also fail when your network connection is poor. Switch to another network or try again later.
updated by yaohan on Jul 28, 2020