Pipefy's mobile app doesn't support logging in with Google credentials. If you've used your Google credentials to sign up for Pipefy and you use them to access the web app, here's what you must do to access the mobile app.
In your web browser, log out of Pipefy then access https://app.pipefy.com/password/new to follow the procedures for generating a new password.
Insert your google email and press 'reset password'. You'll receive a URL in your email that'll enable you to create a new password.
That's the password you'll use to access the mobile app. You don't need to change the way you access the web app, though, you can keep on logging in your Google credentials when using the web app in any browser.