OnePlus 5T (A5010), LineageOS 19 (custom ROM), without Google services.
Worth mentioning, the previous versions of the app worked flawlessly, and actually the latest 8.1.12.0 version kind of works, too: I can run the manual definitions updating by using the "long press menu" on the app icon (in the launcher), and the background virus scan works, too, e.g. when something gets downloaded, or an app is installed/updated.