Or is the only clue that I don't get any work?

I've installed the 8.0.0 client on my old Cubot Quest Lite (Android 9) and signed up for Einstein, ralph and Rosetta. None get any work.
Maybe those projects don't have Android work right now? Or the device is too old/weak, in which case I was hoping there's a message, or log.

this link shows you which projects support which platforms. The three you list say they support Android but not sure how up to date that is. Ralph and Rosetta have not given me any work on Linux for a couple of days now and their server status page is showing no unsent tasks so no big surprise nothing is coming from there.

I've been getting Einstein on my Android 9.

Rosetta does produce work occasionally (I was fortunate enough to get two task a couple of days ago, on an Android 12), but the server status page is currently reporting none available to send out. Ralph hasn't had any tasks for awhile.

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BOINC (for Android) 8.0.0

Einstein has work available. The type of work for Android:
Binary Radio Pulsar Search (Arecibo,GBT) (BRP4)

Log in to your account and from top menu click Preferences, (or follow link https://einsteinathome.org/account/prefs/project).

Then make sure you have selected the correct venue (Preference set) from drop down menu (default, home, school, work) that your Android device is set to receive work from. If you have not changed it it should be under default.

Then click on Project on top menu, scroll down to APPLICATIONS, check the box for what is in bold above, scroll down to end of page and click on save.

Perform a project update on the Android device for Einstein.

It should start to receive work for the project on the next time it asks for more work.

That did it - Einstein is now getting work!

Thanks!