The manual says it works on “any phone or tablet”, running Android 7 or higher. Mine is a OnePlus 6T running LineageOS 20 (Android 13). On my much slower and less well-equipped Samsung Galaxy Tab A7 Lite LTE (3 GB RAM) it installs just fine. Would it really object to being installed just because the phone has an unlocked bootloader? It isn’t rooted, and even banking apps work fine.
Strange. Maybe I’ll file a bug report. It looks like something I might spend $10 on if it works fine.