not installable from Google Play

[pat1]

We are going to use this app in a open project https://rmap.cc/ https://github.com/r-map using udp packets from ESP32 micro controller boards for geolocalization of environmental data.
We have to propose the use of the app in schools at students and teachers; the app is installable from Fdroid but we have tried to install it from Google Play from some different phone (old and new) and it was not possible (not supported device); this will be a problem for a large number of users.
It's possible it need a rebuild?

Thanks for your work!