I do not own an Android smartphone. But I saw a couple of forum entries from people with up-to-date Android device complaining, that HCL Nomad does not run on their devices.

I found an interesting post by Erik Schwalb in the German Notes Forum.

According to this post, the device must support the “64 bit abi for native applications”. https://developer.android.com/ndk/guides/cpp-support

The term “abi” stands for application binary interface and provides a way to run apps on the Android platform, that are written in C/C++ (native) code or linked with any third party native libraries. The core functions of Notes/Domino are written in C++ and therefore a Notes-like client such as HCL Nomad needs this 64 bit abi for native applications. We don’t have a reliable way to tell which Android devices have 64 bit abi support and which do not.
At this point the best way is to try to download the app from the Play Store, and if it’s available, it’s supported and if not, then it’s not supported.

This seems not to be documented.