Are you signing into an existing account or creating a new account? Are you able to sign in at trello.com as expected, just not via the app?
We just released version 2.9.6 of the app, so let's start by making sure you're fully updated to the newest version. If you're still having this problem after that, I would encourage you to reach out with some more computer and OS version details to https://trello.com/contact, and we'll be glad to look into what's going on!
I'm using Trello (for Mac) version 2.9.7. From what I can tell, this is the latest Mac.
I use Trello at work, and I'm unable to log into the Mac app using Google Auth. I can log-in just fine with my web browser.
This is a bug perhaps?
Edit: I was able to workaround this problemn by setting a password, and then using my email and password to login. It's a pain nevertheless.
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