If you read the reviews in Google Playstore this has been an issue even for Pixel devices running Android 12 beta. Either Fidelity has to address incompatiblity issues or they intentionally do not want their app to work on beta OS.
During beta program, the software is not yet certified by Google, and therefore secure services may not work. We apologize for the inconvenience and will post a notice once it becomes certified by Google. You may try again at that time. A community member reached out to fidelity and they mentioned they are working on making a version available.
