Hey hey InfiniteOrg!
We're beginning to track down what may have gone on here, as it sounds similar to a sign in issue being reporting by a small number of our other Solmates.
We believe the issue occurs somewhere in the handoff between the Solo app, and the webpage used to sign in (where you put in your email and password). Can we ask what the default browser set on your device is? Our hope is that if a different default browser works, it'll give us more information to learn where the issue is going on in the system.
I've attached a guide here from Google's website on adjusting your default browser: https://support.google.com/android/answer/14324187?hl=en
We recommend Firefox as a common alternative to install, depending on what's already come with your device. Let us know how you go, but we'll be hard at work continuing our investigations! 🙌