The app in question is dott: https://play.google.com/store/apps/details?id=com.ridedott.rider&hl=en-US
It's used in the Nordics for renting e-scooter and e-bike on demand.
The app fails as soon as you try to start an account, it shows an generic error while a notification of play Integry API usage attempt is shown by the OS. Trying to block usage attempts doesn't solve the issue but triggers a captcha in a WebView, even if solved correctly the registration still doesn't work, the domain for the captcha is Google firebase.
This app may be added to the Attestation compatibility article listing the apps that fail to implement safety checks for GrapheneOS.